7Baggers

United Airlines Holdings, Inc
(NASDAQ:UAL) 

UAL stock logo

United Airlines Holdings, Inc., through its subsidiaries, provides air transportation services in North America, Asia, Europe, Africa, the Pacific, the Middle East, and Latin America. The company transports people and cargo through its mainline and regional fleets. It also sells fuel; and offers cat...

Founded: 1926
Full Time Employees: 87,887
Sector: Industrials
Industry: Airlines

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At a glance:
  • Operating Performance Tied to Passenger Demand and Network Optimization: Results are primarily driven by domestic and international passenger demand, capacity discipline, and how effectively United optimizes its route network and fleet utilization.
  • Fuel and Non-Fuel Costs Remain Key Earnings Sensitivities: Profitability is highly sensitive to jet fuel prices and refining spreads, along with labor, maintenance, and airport-related costs; wage and contract dynamics can materially influence margins.
  • Balance Sheet Priorities: Debt Reduction and Liquidity Management: United’s financial strategy often emphasizes maintaining ample liquidity while managing and reducing leverage accumulated during the pandemic, which affects interest expense and financial flexibility.
  • Operational Reliability and Customer Experience Impact Revenue Quality: On-time performance, cancellations, and service quality can influence pricing power and loyalty-driven revenue, especially for premium cabins and corporate travel recovery trends.
  • Competitive Landscape and Capacity Decisions Drive Unit Revenue: Unit revenue performance depends on industry capacity growth, competitive pricing, and United’s ability to capture higher-yield traffic through premium offerings and international expansion.
Bull Thesis:
  • Robust Travel Demand and Network Strength: United Airlines continues to benefit from strong pent-up demand for both leisure and business travel, particularly in international markets where UAL has a significant presence. Its strategically located hubs and extensive global network provide a competitive advantage in capturing high-value traffic.
  • Premiumization Strategy and Revenue Growth: UAL's focus on premium products and services (e.g., Polaris business class, Premium Plus economy) is driving higher revenue per available seat mile (RASM). This strategy caters to higher-paying customers and improves overall profitability, making the airline less susceptible to fare wars in basic economy.
  • Fleet Modernization and Operational Efficiency: The company is actively modernizing its fleet with newer, more fuel-efficient aircraft. This not only reduces operating costs and carbon emissions but also enhances the passenger experience, potentially leading to improved reliability and customer satisfaction.
  • Valuable Loyalty Program (MileagePlus): United's MileagePlus loyalty program is a significant asset, generating substantial revenue through co-branded credit cards and partnerships. The program fosters customer loyalty and provides a stable, high-margin revenue stream that can partially offset cyclicality in core airline operations.
Bear Thesis:
  • Persistent High Fuel Costs and Volatility: Airlines remain highly exposed to fluctuations in jet fuel prices. Geopolitical events and supply chain disruptions can lead to sudden spikes, significantly impacting UAL's operating expenses and eroding profit margins, despite hedging efforts.
  • Labor Cost Pressures and Negotiations: The airline industry is facing significant labor cost inflation, driven by ongoing negotiations with pilot, flight attendant, and mechanic unions. New contracts often include substantial wage increases and improved benefits, which can put upward pressure on UAL's operating costs for the foreseeable future.
  • Risk of Economic Slowdown and Reduced Demand: A global or domestic economic recession could lead to a significant reduction in both leisure and business travel demand. This would result in lower passenger volumes, increased fare competition, and ultimately, a negative impact on UAL's revenue and profitability.
  • Operational Challenges and Infrastructure Constraints: United, like other major carriers, faces ongoing operational challenges including air traffic control (ATC) limitations, staffing shortages (e.g., pilots, ground staff), and adverse weather events. These issues can lead to flight delays, cancellations, increased costs, and damage to customer satisfaction.
Main Competitors:
  • Delta Air Lines, Inc. ($DAL) (Airline services), A direct legacy competitor, Delta competes with United across domestic and international routes, particularly in key business markets and through its global SkyTeam alliance. They vie for premium passengers, corporate contracts, and market share by focusing on operational reliability, customer service, and a strong loyalty program.
  • American Airlines Group Inc. ($AAL) (Airline services), Another major legacy carrier, American Airlines directly competes with United on network size, frequency, and connectivity, especially through its Oneworld alliance. They battle for market dominance in major hubs, international gateways, and through their respective loyalty programs and corporate travel offerings.
  • Southwest Airlines Co. ($LUV) (Airline services), Southwest is a significant low-cost competitor, primarily on domestic point-to-point routes. While often serving different segments, Southwest's competitive pricing, no change fees policy, and strong customer loyalty can draw leisure and some business travelers away from United, particularly on shorter-haul flights.
  • Alaska Air Group, Inc. ($ALK) (Airline services), Alaska Airlines is a strong regional and growing national competitor, particularly on the West Coast and increasingly across the US. Known for its customer service and operational efficiency, Alaska competes with United on specific routes, often offering a premium experience at competitive prices, and is part of the Oneworld alliance.
Moat:
United Airlines Holdings, Inc. operates in a highly competitive industry characterized by significant capital investment, regulatory oversight, and sensitivity to economic conditions. Its primary moat lies in its extensive global network, including its major hub airports and its leadership role in the Star Alliance, which provides unparalleled international reach. A strong loyalty program (MileagePlus), significant fleet size, and established brand recognition also contribute to its competitive advantages. However, United faces intense competition on multiple fronts: from other legacy carriers (Delta, American) for premium and corporate travelers, from low-cost carriers (Southwest, Spirit, Frontier) on price-sensitive domestic routes, and from international carriers on long-haul routes. The industry also sees constant pressure on pricing, the need for continuous investment in fleet modernization and technology, and vulnerability to external shocks like fuel price volatility and geopolitical events.
Income Statements:
Quarterly
Annual
    Unit: USD2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-03-31 2023-12-31 2023-03-31 2022-12-31 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2013-12-31 2013-09-30 2012-12-31 2012-09-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-09-30 2008-02-01 2007-06-30 2003-12-31 2003-03-28 
                                             
      operating revenue:
                                             
      passenger revenue
    13,815,000,000 13,836,000,000 11,860,000,000    10,274,000,000  6,348,000,000 6,878,000,000 6,637,000,000 4,366,000,000 2,316,000,000 2,348,750,000 1,649,000,000 681,000,000 7,065,000,000 9,933,000,000 10,481,000,000 10,486,000,000 8,725,000,000 9,556,000,000 10,120,000,000 9,880,000,000 8,149,000,000                 
      cargo revenue
    431,000,000 430,000,000 429,000,000                                       
      other operating revenue
    979,000,000 970,000,000 923,000,000    757,000,000  591,000,000 587,000,000 594,000,000 499,000,000 408,000,000 365,000,000 418,000,000 392,000,000 650,000,000 454,000,000 617,000,000 621,000,000 578,000,000 601,000,000 587,000,000 583,000,000 590,000,000 1,054,000,000 1,093,000,000 785,750,000 1,111,000,000             
      total operating revenue
    15,225,000,000 15,236,000,000 13,213,000,000  12,539,000,000  11,429,000,000  7,566,000,000 8,192,000,000 7,750,000,000 5,471,000,000 3,221,000,000 2,985,750,000 2,489,000,000 1,475,000,000 7,979,000,000 8,092,750,000 11,380,000,000 11,402,000,000 9,589,000,000 10,491,000,000 11,003,000,000 10,777,000,000 9,032,000,000 9,438,000,000 9,878,000,000               
      operating expense:
                                             
      salaries and related costs
    4,555,000,000 4,413,000,000 4,155,000,000  3,932,000,000  3,322,000,000  2,787,000,000 2,579,000,000 2,487,000,000 2,276,000,000 2,224,000,000 1,838,500,000 2,229,000,000 2,170,000,000 2,955,000,000 2,248,250,000 3,063,000,000 3,057,000,000 2,873,000,000 2,924,000,000 2,930,000,000 2,878,000,000 2,726,000,000 2,704,000,000 2,812,000,000 1,627,750,000 2,209,000,000   948,000,000 2,819,000,000 954,000,000 963,000,000 921,000,000 1,037,000,000  1,019,000,000   
      aircraft fuel
    2,997,000,000 2,775,000,000 2,701,000,000  2,954,000,000  3,174,000,000  2,230,000,000 1,962,000,000 1,710,000,000 1,232,000,000 851,000,000 618,500,000 508,000,000 240,000,000 1,726,000,000 1,676,000,000 2,296,000,000 2,385,000,000 2,023,000,000 2,380,000,000 2,572,000,000 2,390,000,000 1,965,000,000 1,875,000,000 1,809,000,000 2,345,000,000 3,262,000,000   958,000,000 2,341,000,000 1,064,000,000 665,000,000 799,000,000 2,461,000,000  1,206,000,000   
      landing fees and other rent
    1,002,000,000 961,000,000 873,000,000  804,000,000  717,000,000  612,000,000 681,000,000 652,000,000 564,000,000 519,000,000 388,000,000 500,000,000 429,000,000 623,000,000 473,250,000 645,000,000 660,000,000 588,000,000 602,000,000 596,000,000 603,000,000 558,000,000 570,000,000 585,000,000 386,000,000 540,000,000   228,000,000 679,000,000 226,000,000 229,000,000 221,000,000 222,000,000  215,000,000   
      aircraft maintenance materials and outside repairs
    779,000,000 865,000,000 731,000,000  773,000,000  702,000,000  407,000,000 399,000,000 346,000,000 302,000,000 269,000,000 164,750,000 115,000,000 110,000,000 434,000,000 329,750,000 490,000,000 421,000,000 408,000,000 434,000,000 455,000,000 438,000,000 440,000,000 479,000,000 451,000,000 347,500,000 472,000,000   222,000,000 712,000,000 253,000,000 240,000,000 225,000,000 256,000,000  284,000,000   
      depreciation and amortization
    730,000,000 733,000,000 727,000,000  708,000,000  655,000,000  611,000,000 619,000,000 623,000,000 620,000,000 623,000,000 464,750,000 626,000,000 618,000,000 615,000,000 420,500,000 575,000,000 560,000,000 547,000,000 578,000,000 564,000,000 557,000,000 541,000,000 539,000,000 556,000,000 317,000,000 435,000,000   213,000,000 682,000,000 220,000,000 222,000,000 233,000,000 234,000,000  229,000,000   
      regional capacity purchase
    686,000,000 676,000,000 650,000,000  585,000,000  615,000,000  565,000,000 601,000,000 520,000,000 547,000,000 479,000,000 387,500,000 425,000,000 388,000,000 737,000,000 531,000,000 721,000,000 715,000,000 688,000,000 638,000,000 663,000,000 681,000,000 619,000,000 580,000,000 567,000,000 459,250,000 621,000,000             
      distribution expenses
    555,000,000 487,000,000 496,000,000  480,000,000  403,000,000  226,000,000 235,000,000 218,000,000 139,000,000 85,000,000 94,750,000 53,000,000 31,000,000 295,000,000 308,500,000 432,000,000 442,000,000 360,000,000 396,000,000 427,000,000 393,000,000 342,000,000 328,000,000 352,000,000 263,000,000 377,000,000   137,000,000 389,000,000 145,000,000 139,000,000 118,000,000 181,000,000  197,000,000   
      aircraft rent
    54,000,000 67,000,000 51,000,000  43,000,000  56,000,000  61,000,000 63,000,000 58,000,000 52,000,000 55,000,000 36,750,000 50,000,000 47,000,000 50,000,000 55,250,000 67,000,000 73,000,000 81,000,000 78,000,000 109,000,000 119,000,000 127,000,000 145,000,000 145,000,000 176,500,000 231,000,000   81,000,000 258,000,000 88,000,000 89,000,000 88,000,000 115,000,000  105,000,000   
      special charges
    -73,000,000 447,000,000 -108,000,000  13,000,000  14,000,000  -8,000,000 56,000,000 -1,098,000,000 -948,000,000 -1,377,000,000 -616,750,000 -1,081,000,000 -1,449,000,000 63,000,000 29,000,000 27,000,000 71,000,000 18,000,000 301,000,000 17,000,000 129,000,000 40,000,000 31,000,000 50,000,000 88,750,000 211,000,000             
      other operating expenses
    2,546,000,000 2,487,000,000 2,326,000,000    1,814,000,000  1,451,000,000 1,405,000,000 1,197,000,000 957,000,000 874,000,000 665,000,000 679,000,000 528,000,000 1,453,000,000 1,161,250,000 1,591,000,000 1,546,000,000 1,508,000,000 1,508,000,000 1,467,000,000 1,428,000,000 1,398,000,000 1,458,000,000 1,459,000,000 973,250,000 1,362,000,000   208,000,000 717,000,000 239,000,000 222,000,000 238,000,000 275,000,000  276,000,000   
      total operating expense
    13,830,000,000 13,911,000,000 12,605,000,000  12,440,000,000  11,472,000,000  8,942,000,000 8,600,000,000 6,713,000,000 5,741,000,000 4,602,000,000                             
      operating income
    1,395,000,000 1,325,000,000 607,000,000  99,000,000  -43,000,000  -1,376,000,000 -408,000,000 1,037,000,000 -270,000,000 -1,381,000,000 -1,056,000,000 -1,615,000,000 -1,637,000,000 -972,000,000 860,000,000 1,473,000,000 1,472,000,000 495,000,000 652,000,000 1,203,000,000 1,161,000,000 276,000,000 729,000,000 1,092,000,000 235,000,000 508,000,000             
      yoy
    1309.09%  -1511.63%  -107.19%  -104.15%  -0.36% -61.36% -164.21% -83.51% 42.08% -222.79% -209.64% -211.21% -296.36% 31.90% 22.44% 26.79% 79.35% -10.56% 10.16% 394.04% -45.67%                 
      qoq
    5.28% 118.29%       237.25% -139.34% -484.07% -80.45% 30.78% -34.61% -1.34% 68.42% -213.02% -41.62% 0.07% 197.37% -24.08% -45.80% 3.62% 320.65% -62.14% -33.24% 364.68% -53.74%              
      nonoperating income:
                                             
      interest expense
    -331,000,000 -361,000,000 -356,000,000  -454,000,000  -486,000,000  -424,000,000 -429,000,000 -449,000,000 -426,000,000 -353,000,000 -178,000,000 -345,000,000 -196,000,000 -171,000,000 -142,500,000 -191,000,000 -191,000,000 -188,000,000 -189,000,000 -187,000,000 -177,000,000 -176,000,000 -171,000,000 -164,000,000 -147,500,000 -195,000,000   -178,000,000 -431,000,000 -146,000,000 -135,000,000 -134,000,000 -131,000,000  -139,000,000   
      interest income
    142,000,000 167,000,000 164,000,000  177,000,000  170,000,000  5,000,000 6,000,000 11,000,000 12,000,000 7,000,000 11,250,000 8,000,000 11,000,000 26,000,000 25,750,000 36,000,000 38,000,000 29,000,000 31,000,000 28,000,000 25,000,000 17,000,000 16,000,000 17,000,000 4,000,000 5,000,000   1,000,000 16,000,000 3,000,000 5,000,000 7,000,000 24,000,000  62,000,000   
      interest capitalized
    53,000,000 51,000,000 48,000,000  61,000,000  38,000,000  24,000,000 23,000,000 18,000,000 22,000,000 17,000,000 13,500,000 16,000,000 17,000,000 21,000,000 16,250,000 22,000,000 21,000,000 22,000,000 19,000,000 18,000,000 14,000,000 19,000,000 20,000,000 20,000,000 8,750,000 12,000,000   2,000,000 7,000,000 3,000,000 2,000,000 3,000,000 6,000,000  4,000,000   
      unrealized losses on investments
    -13,000,000  -21,000,000          -22,000,000                             
      miscellaneous
    9,000,000 41,000,000 36,000,000  -10,000,000  41,000,000  19,000,000 88,000,000 20,000,000 -49,000,000 -19,000,000 -329,250,000 -411,000,000 -207,000,000 -699,000,000 8,000,000 9,000,000 14,000,000 9,000,000 43,000,000 -1,000,000 -166,000,000 48,000,000  15,000,000 -12,000,000 52,000,000   24,000,000 47,000,000 -10,000,000 35,000,000 -6,000,000 -186,000,000  1,000,000   
      total nonoperating expense
    -141,000,000 -77,000,000 -129,000,000  -263,000,000  -213,000,000  -376,000,000 -437,000,000 -434,000,000 -294,000,000 -370,000,000 -556,250,000 -717,000,000 -366,000,000 -1,142,000,000 -92,500,000 -124,000,000 -118,000,000 -128,000,000 -96,000,000 -142,000,000 -304,000,000 -92,000,000 -129,000,000 -112,000,000               
      income before income taxes
    1,255,000,000 1,248,000,000 478,000,000       -845,000,000 603,000,000   -1,612,250,000 -2,332,000,000 -2,003,000,000 -2,114,000,000 767,500,000 1,349,000,000 1,354,000,000 367,000,000 556,000,000 1,061,000,000 857,000,000 184,000,000 600,000,000 980,000,000 106,750,000 382,000,000             
      income tax expense
    306,000,000 275,000,000                175,500,000 325,000,000 302,000,000 75,000,000 94,000,000 225,000,000 173,000,000 37,000,000 20,000,000 343,000,000 -1,000,000 3,000,000          192,000,000   
      net income
    949,000,000 973,000,000 387,000,000  -124,000,000  -194,000,000  -1,377,000,000 -646,000,000 473,000,000 -434,000,000 -1,357,000,000 -1,293,000,000 -1,841,000,000 -1,627,000,000 -1,704,000,000 641,000,000 1,024,000,000 1,052,000,000 292,000,000 462,000,000 836,000,000 684,000,000 147,000,000 580,000,000 637,000,000 140,000,000 379,000,000   -82,000,000 -594,000,000 -57,000,000 28,000,000 -382,000,000 -779,000,000  274,000,000   
      yoy
    -865.32%  -299.48%  -90.99%  -141.01%  1.47% -50.04% -125.69% -73.33% -20.36% -301.72% -279.79% -254.66% -683.56% 38.74% 22.49% 53.80% 98.64% -20.34% 31.24% 388.57% -61.21%   -270.73% -163.80%   -78.53% -23.75%  -89.78%       
      qoq
    -2.47% 151.42%       113.16% -236.58% -208.99% -68.02% 4.95% -29.77% 13.15% -4.52% -365.83% -37.40% -2.66% 260.27% -36.80% -44.74% 22.22% 365.31% -74.66% -8.95% 355.00% -63.06%    -86.20% 942.11% -303.57% -107.33% -50.96%      
      earnings per share, basic
    2.93 1.18       -2 1.46   -4.728 -6.33 -5.79  2.56 4.01 4.03  1.71 3.07 2.49  1.98 2.12 0.313 1.06        -6.13  2.31   
      earnings per share, diluted
    2.9 2.97 1.16       -2 1.44   -4.728 -6.33 -5.79  2.54 3.99 4.02  1.71 3.06 2.48  1.98 2.12 0.288 0.98        -6.13  1.83   
      unrealized gains on investments
     26,000,000   -37,000,000  24,000,000   -125,000,000 -34,000,000 147,000,000  -73,750,000 15,000,000 9,000,000 -319,000,000                         
      income tax benefit
      91,000,000  -40,000,000  -62,000,000  -375,000,000 -98,500,000 130,000,000 -130,000,000 -394,000,000 -319,250,000 -491,000,000 -376,000,000 -410,000,000               1,000,000 -13,000,000 -4,000,000 -13,000,000 -29,000,000 2,000,000     
      passenger
        11,313,000,000                                     
      cargo
        391,000,000  398,000,000  627,000,000 727,000,000 519,000,000 606,000,000 497,000,000 272,000,000 422,000,000 402,000,000 264,000,000 215,750,000 282,000,000 295,000,000 286,000,000 334,000,000 296,000,000 314,000,000 293,000,000 304,000,000 257,000,000 165,500,000 199,000,000   157,000,000 411,000,000 125,000,000 121,000,000 124,000,000 219,000,000  181,000,000   
      other
        835,000,000                                     
      income before income tax benefit
        -164,000,000  -256,000,000  -1,752,000,000   -564,000,000 -1,751,000,000                             
      loss per share, basic and diluted
        -0.38  -0.59  -4.24   -1.34 -4.29                   -0.49 -0.098 -0.39  -2.64      
      total operating expenses
                 4,041,750,000 4,104,000,000 3,112,000,000 8,951,000,000 7,232,750,000 9,907,000,000 9,930,000,000 9,094,000,000 7,043,000,000 9,800,000,000 9,616,000,000 8,756,000,000 8,709,000,000 8,786,000,000               
      earnings per share, basic and diluted
                    -6.86    1.09    0.52          0.19       
      passenger—mainline
                             6,582,000,000 7,083,000,000 4,948,000,000 7,025,000,000             
      passenger—regional
                             1,498,000,000 1,445,000,000 1,338,250,000 1,893,000,000             
      total passenger revenue
                             8,080,000,000 8,528,000,000 6,286,250,000 8,918,000,000             
      operating revenues:
                                             
      passenger — united airlines
                                   3,026,000,000 816,750,000 3,267,000,000 2,941,000,000 2,701,000,000 4,280,000,000     
      passenger — regional affiliates
                                   840,000,000 211,000,000 844,000,000 749,000,000 659,000,000 834,000,000     
      other operating revenues
                                   218,000,000 628,000,000 197,000,000 207,000,000 207,000,000 232,000,000  260,000,000   
      operating expenses:
                                             
      regional affiliates
                                   815,000,000 2,164,000,000 775,000,000 708,000,000 671,000,000 882,000,000  733,000,000   
      purchased services
                                   287,000,000 888,000,000 279,000,000 286,000,000 287,000,000 327,000,000  335,000,000   
      cost of third party sales
                                   57,000,000 171,000,000 59,000,000 60,000,000 53,000,000 75,000,000  77,000,000   
      impairments and special items
                                   18,000,000          
      earnings from operations
                                   69,000,000 -249,000,000 88,000,000 107,000,000    537,000,000   
      other income:
                                             
      income before income taxes and equity in earnings of affiliates
                                   -82,000,000 -15,500,000 -62,000,000  -412,000,000 -778,000,000     
      income before equity in earnings of affiliates
                                   -83,000,000 -14,500,000 -58,000,000  -383,000,000 -780,000,000     
      equity in earnings of affiliates, net of tax
                                   1,000,000 3,000,000 1,000,000 1,000,000 1,000,000 1,000,000  1,000,000   
      other impairments and special items
                                    331,000,000 43,000,000 88,000,000  -9,000,000     
      goodwill impairment
                                             
      earnings before income taxes and equity in earnings of affiliates
                                      14,000,000       
      earnings before equity in earnings of affiliates
                                      27,000,000    273,000,000   
      asset impairment and special items
                                       119,000,000      
      income from operations
                                       -282,000,000 -491,000,000     
      special operating items
                                             
      passenger - united airlines
                                          3,968,000,000   
      passenger - regional affiliates
                                          804,000,000   
      earnings before income taxes and equity in earnings
                                             
      of affiliates
                                          465,000,000   
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-09-30 2012-06-30 2012-03-31 2011-09-30 2011-06-30 2011-03-31 2010-06-30 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2007-10-08 2007-06-30 2006-12-31 2005-12-31 2003-12-31 2003-03-28 2001-03-15 
                                                                            
        cash and cash equivalents
      5,942,000,000 6,730,000,000 9,354,000,000 9,370,000,000 8,769,000,000 8,812,000,000 10,864,000,000 8,401,000,000 6,058,000,000 9,605,000,000 7,634,000,000 7,166,000,000 11,258,000,000 16,885,000,000 18,468,000,000 18,283,000,000 19,256,000,000 20,838,000,000 12,666,000,000 11,269,000,000 13,150,000,000 6,505,000,000 3,442,000,000 2,762,000,000 2,959,000,000 3,221,000,000 1,848,000,000  2,621,000,000 2,884,000,000 2,404,000,000 1,482,000,000 1,870,000,000 2,371,000,000 2,164,000,000 2,179,000,000 2,630,000,000 2,483,000,000 1,795,000,000 3,006,000,000 3,427,000,000 2,796,000,000 3,352,000,000 2,002,000,000 3,117,000,000 3,424,000,000 3,009,000,000 3,220,000,000 3,935,000,000 4,143,000,000 3,538,000,000 5,129,000,000 6,086,000,000 5,606,000,000 6,984,000,000 7,519,000,000 8,165,000,000  2,525,000,000 2,566,000,000 2,457,000,000 2,039,000,000 2,931,000,000 1,263,000,000 1,667,000,000 3,832,000,000 1,761,000,000 1,640,000,000 886,000,000 1,679,000,000 
        short-term investments
      6,298,000,000 6,599,000,000 6,262,000,000 5,960,000,000 5,706,000,000 5,352,000,000 4,384,000,000 5,591,000,000 8,330,000,000 9,533,000,000 9,522,000,000 9,248,000,000 7,437,000,000 3,190,000,000 211,000,000 123,000,000 166,000,000 230,000,000 309,000,000 414,000,000 552,000,000 958,000,000 1,779,000,000 2,182,000,000 2,167,000,000 2,223,000,000 2,219,000,000  2,314,000,000 2,187,000,000 2,071,000,000 2,316,000,000 2,458,000,000 2,278,000,000 2,215,000,000 2,249,000,000 2,226,000,000 2,202,000,000 2,177,000,000 2,190,000,000 2,172,000,000 2,189,000,000 2,256,000,000 2,382,000,000 2,397,000,000 2,372,000,000 2,015,000,000 1,901,000,000 1,801,000,000 1,821,000,000 1,852,000,000 1,551,000,000 1,618,000,000 1,667,000,000 1,373,000,000 1,060,000,000 722,000,000       2,899,000,000 2,582,000,000 312,000,000 77,000,000 78,000,000 388,000,000 665,000,000 
        receivables
      2,391,000,000 2,433,000,000 2,286,000,000 2,288,000,000 2,163,000,000                                                                  
        aircraft fuel, spare parts and supplies
      1,556,000,000 1,588,000,000 1,547,000,000 1,601,000,000 1,572,000,000                                                                  
        prepaid expenses and other
      671,000,000 744,000,000 809,000,000 928,000,000 673,000,000 690,000,000 669,000,000 730,000,000 609,000,000 836,000,000 787,000,000 689,000,000 783,000,000 883,000,000 762,000,000 745,000,000 717,000,000 646,000,000 483,000,000 635,000,000 566,000,000 766,000,000 822,000,000 814,000,000 725,000,000 708,000,000 780,000,000 913,000,000 973,000,000 1,028,000,000 1,128,000,000 1,051,000,000 1,009,000,000 1,218,000,000 1,016,000,000 832,000,000 791,000,000 911,000,000 912,000,000 740,000,000 819,000,000 881,000,000 826,000,000 730,000,000 838,000,000 839,000,000 845,000,000 704,000,000 700,000,000 790,000,000 845,000,000 837,000,000 797,000,000 783,000,000 595,000,000 773,000,000 660,000,000  404,000,000 373,000,000 399,000,000 382,000,000 623,000,000 643,000,000 400,000,000 345,000,000 488,000,000 412,000,000 219,000,000 460,000,000 
        total current assets
      16,857,000,000 18,094,000,000 20,258,000,000 20,148,000,000 18,883,000,000 18,571,000,000 20,003,000,000 18,696,000,000 18,487,000,000 23,306,000,000 21,586,000,000 20,058,000,000 22,689,000,000 24,371,000,000 22,612,000,000 21,834,000,000 23,057,000,000 24,673,000,000 16,019,000,000 14,800,000,000 16,476,000,000 10,041,000,000 7,905,000,000 8,194,000,000 8,533,000,000 8,910,000,000 7,608,000,000  8,671,000,000 8,881,000,000 8,287,000,000 7,113,000,000 7,877,000,000 8,248,000,000 7,724,000,000                                    
        operating property and equipment
      46,121,000,000 44,968,000,000 43,896,000,000 43,430,000,000 42,908,000,000                                                                  
        operating lease right-of-use assets
      4,958,000,000 4,821,000,000 4,517,000,000 4,092,000,000 3,815,000,000 3,782,000,000 3,803,000,000 3,895,000,000 3,914,000,000 3,995,000,000 4,019,000,000 3,889,000,000 4,280,000,000 4,440,000,000 4,579,000,000 4,645,000,000 4,697,000,000 4,421,000,000 4,516,000,000 4,537,000,000 4,544,000,000 4,738,000,000 4,853,000,000 4,758,000,000 4,937,000,000 4,908,000,000 5,065,000,000                                            
        goodwill
      4,527,000,000 4,527,000,000 4,527,000,000 4,527,000,000 4,527,000,000 4,527,000,000 4,527,000,000 4,527,000,000 4,527,000,000 4,527,000,000 4,527,000,000 4,527,000,000 4,527,000,000 4,527,000,000 4,527,000,000 4,527,000,000 4,527,000,000 4,527,000,000 4,527,000,000 4,527,000,000 4,527,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000  4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000 4,523,000,000       2,695,000,000 2,697,000,000 2,703,000,000     
        intangible assets
      2,655,000,000 2,662,000,000 2,669,000,000 2,676,000,000 2,683,000,000                                                                  
        investments in affiliates and other
      1,330,000,000 1,242,000,000 1,295,000,000 1,239,000,000 1,267,000,000           1,344,000,000    1,000,000,000 824,000,000 798,000,000 763,000,000 1,180,000,000 1,131,000,000 1,139,000,000 1,098,000,000  848,000,000 848,000,000 853,000,000 852,000,000 882,000,000                                      
        total noncurrent assets
      59,591,000,000 58,219,000,000 56,904,000,000 55,963,000,000 55,200,000,000                                                                  
        total assets
      76,448,000,000 76,313,000,000 77,163,000,000 76,111,000,000 74,083,000,000 72,640,000,000 73,254,000,000 71,902,000,000 71,104,000,000 73,341,000,000 70,417,000,000 67,358,000,000 68,968,000,000 70,381,000,000 69,038,000,000 68,175,000,000 69,294,000,000 71,049,000,000 61,662,000,000 59,548,000,000 61,189,000,000 54,901,000,000 53,055,000,000 52,611,000,000 52,199,000,000 52,150,000,000 50,639,000,000  44,837,000,000 44,691,000,000 44,018,000,000 42,326,000,000 42,565,000,000 42,307,000,000 41,445,000,000                                    
        liabilities and stockholders' equity
              2,023,000,000   2,022,000,000    2,021,000,000    2,020,000,000    2,019,000,000                                            2,003,000,000 2,002,000,000 2,000,000,000 
        accounts payable
      4,567,000,000 4,636,000,000 4,920,000,000 4,694,000,000 4,193,000,000 4,008,000,000 4,478,000,000 4,344,000,000 3,835,000,000 4,172,000,000 3,858,000,000 3,395,000,000 3,534,000,000 3,755,000,000 2,966,000,000 2,562,000,000 2,199,000,000 2,218,000,000 1,838,000,000 1,595,000,000 1,831,000,000 1,725,000,000 2,436,000,000 2,703,000,000 2,848,000,000 3,033,000,000 2,707,000,000  2,581,000,000 2,703,000,000 2,399,000,000 2,196,000,000 2,231,000,000 2,225,000,000 2,135,000,000 2,139,000,000 2,138,000,000 2,240,000,000 2,065,000,000 1,869,000,000 2,082,000,000 2,322,000,000 2,074,000,000 1,882,000,000 2,085,000,000 2,441,000,000 2,332,000,000 2,087,000,000 2,126,000,000 2,298,000,000 2,293,000,000 2,188,000,000 2,165,000,000 2,220,000,000 1,808,000,000 1,999,000,000 1,897,000,000  807,000,000 791,000,000 784,000,000 829,000,000 821,000,000 830,000,000 861,000,000 667,000,000 596,000,000 501,000,000 284,000,000 1,188,000,000 
        accrued salaries and benefits
      3,900,000,000 3,555,000,000 3,211,000,000 2,394,000,000 3,289,000,000 2,802,000,000 2,383,000,000 2,128,000,000 2,940,000,000 3,223,000,000 1,970,000,000 1,971,000,000 1,841,000,000 1,943,000,000 2,008,000,000 2,121,000,000 2,207,000,000 2,228,000,000 2,267,000,000 1,960,000,000 1,994,000,000 1,669,000,000 1,647,000,000 2,271,000,000 2,104,000,000 1,871,000,000 1,660,000,000  2,004,000,000 1,782,000,000 1,637,000,000 2,166,000,000 1,983,000,000 1,812,000,000 1,569,000,000 2,307,000,000 2,282,000,000 1,969,000,000 1,822,000,000 2,350,000,000 2,187,000,000 1,846,000,000 1,597,000,000 1,818,000,000 1,651,000,000 1,460,000,000 1,363,000,000 1,696,000,000 1,844,000,000 1,480,000,000 1,455,000,000 1,328,000,000 1,230,000,000 1,139,000,000 1,404,000,000 1,229,000,000 1,208,000,000              
        advance ticket sales
      8,131,000,000 9,338,000,000 9,664,000,000 10,477,000,000 7,561,000,000 8,477,000,000 9,365,000,000 9,601,000,000 6,704,000,000 10,102,000,000 10,158,000,000 7,555,000,000 8,747,000,000 9,931,000,000 8,904,000,000 6,354,000,000 6,363,000,000 6,960,000,000 5,502,000,000 4,833,000,000 4,907,000,000 4,950,000,000 5,309,000,000 4,819,000,000 5,515,000,000 6,126,000,000 6,006,000,000  5,193,000,000 5,826,000,000 5,501,000,000 3,876,000,000 4,537,000,000 5,102,000,000 5,001,000,000 3,730,000,000 4,558,000,000 5,323,000,000 4,958,000,000 3,753,000,000 4,492,000,000 5,175,000,000 4,932,000,000 3,701,000,000 4,514,000,000 5,027,000,000 4,804,000,000 3,405,000,000 4,123,000,000 4,801,000,000 4,633,000,000 3,849,000,000 4,667,000,000 4,433,000,000 3,761,000,000 4,497,000,000 4,324,000,000  1,675,000,000 1,916,000,000 1,768,000,000 1,530,000,000 2,251,000,000 2,246,000,000 2,657,000,000 1,669,000,000 1,575,000,000 1,330,000,000 1,021,000,000 1,454,000,000 
        frequent flyer deferred revenue
      3,721,000,000 3,642,000,000 3,552,000,000 3,473,000,000 3,403,000,000 3,314,000,000 3,252,000,000 3,086,000,000 3,095,000,000 2,841,000,000 2,832,000,000 2,693,000,000 2,642,000,000 2,590,000,000 2,516,000,000 2,239,000,000 2,129,000,000 2,099,000,000 1,251,000,000 908,000,000 772,000,000 840,000,000 1,355,000,000 2,440,000,000 2,537,000,000 2,435,000,000 2,388,000,000  2,275,000,000 2,206,000,000 2,221,000,000 2,176,000,000 1,992,000,000 2,069,000,000 2,120,000,000 2,135,000,000 2,168,000,000 2,132,000,000 2,098,000,000 2,117,000,000 2,138,000,000 2,116,000,000 2,059,000,000 2,058,000,000 2,090,000,000 2,147,000,000 2,318,000,000 2,369,000,000 2,378,000,000 2,343,000,000 2,312,000,000 2,405,000,000 2,526,000,000 2,607,000,000 2,507,000,000 2,491,000,000 2,565,000,000              
        current maturities of long-term debt, finance leases, and other financial liabilities
      4,426,000,000 4,621,000,000 6,194,000,000 3,265,000,000 3,453,000,000                                                                  
        current maturities of operating leases
      631,000,000 563,000,000 541,000,000 506,000,000 467,000,000 491,000,000 548,000,000 557,000,000 576,000,000 571,000,000 610,000,000 561,000,000 546,000,000 543,000,000 538,000,000 556,000,000 569,000,000 583,000,000 623,000,000 612,000,000 623,000,000 598,000,000 688,000,000 686,000,000 778,000,000 637,000,000 639,000,000                                            
        other
      757,000,000 763,000,000 910,000,000 990,000,000 948,000,000 838,000,000 894,000,000 910,000,000 806,000,000 826,000,000 897,000,000 779,000,000 746,000,000 678,000,000 613,000,000 560,000,000 1,083,000,000 819,000,000 724,000,000 724,000,000 944,000,000 558,000,000 538,000,000 566,000,000 574,000,000 604,000,000 601,000,000 619,000,000 585,000,000 571,000,000 646,000,000 569,000,000 703,000,000 685,000,000 618,000,000 579,000,000 549,000,000 528,000,000 546,000,000 553,000,000 828,000,000 916,000,000 669,000,000 665,000,000 706,000,000 773,000,000 748,000,000 740,000,000 729,000,000 822,000,000 788,000,000 756,000,000 739,000,000 730,000,000 795,000,000 816,000,000 731,000,000  1,010,000,000 996,000,000 1,019,000,000 999,000,000 817,000,000 739,000,000 755,000,000 737,000,000 585,000,000 717,000,000 918,000,000 850,000,000 
        total current liabilities
      26,133,000,000 27,119,000,000 28,992,000,000 25,798,000,000 23,314,000,000 23,365,000,000 25,855,000,000 24,764,000,000 22,203,000,000 25,575,000,000 23,635,000,000 19,992,000,000 21,989,000,000 23,444,000,000 21,788,000,000 18,304,000,000 16,935,000,000 18,064,000,000 14,167,000,000 12,725,000,000 15,791,000,000 16,395,000,000 16,087,000,000 14,938,000,000 15,691,000,000 16,078,000,000 15,335,000,000  13,684,000,000 14,092,000,000 14,183,000,000 12,676,000,000 13,087,000,000 13,596,000,000 12,662,000,000                                    
        long-term debt, finance leases, and other financial liabilities
      20,562,000,000 20,807,000,000 20,885,000,000 24,398,000,000 25,203,000,000                                                                  
        long-term obligations under operating leases
      5,417,000,000 5,331,000,000 5,166,000,000 4,756,000,000 4,510,000,000 4,432,000,000 4,443,000,000 4,517,000,000 4,503,000,000 4,607,000,000 4,569,000,000 4,459,000,000 4,803,000,000 4,997,000,000 5,143,000,000 5,152,000,000 5,163,000,000 4,920,000,000 4,985,000,000 4,986,000,000 4,943,000,000 5,113,000,000 5,060,000,000 4,946,000,000 4,941,000,000 5,034,000,000 5,145,000,000                                            
        pension and postretirement benefit liability
      1,058,000,000 974,000,000 1,199,000,000 1,252,000,000 1,233,000,000                                                                  
        deferred income taxes
      2,463,000,000 2,206,000,000 1,919,000,000 1,624,000,000 1,580,000,000 1,224,000,000 951,000,000 545,000,000   159,000,000 91,000,000 701,000,000 907,000,000 1,032,000,000 659,000,000 519,000,000 647,000,000 520,000,000 131,000,000 389,000,000 804,000,000 1,322,000,000 1,736,000,000 1,594,000,000 1,192,000,000 898,000,000 814,000,000 639,000,000 419,000,000 250,000,000   127,000,000 598,000,000 655,000,000 863,000,000 1,392,000,000 1,800,000,000 2,037,000,000 1,306,000,000 619,000,000 575,000,000 591,000,000 582,000,000 586,000,000 620,000,000 676,000,000 568,000,000 540,000,000 494,000,000 641,000,000 658,000,000 610,000,000 643,000,000 622,000,000 554,000,000  92,000,000 102,000,000 202,000,000 263,000,000 127,000,000 77,000,000 66,000,000 122,000,000 428,000,000 22,000,000 249,000,000 225,000,000 
        total noncurrent liabilities
      35,033,000,000 34,886,000,000 34,798,000,000 37,697,000,000 38,094,000,000                                                                  
        commitments and contingencies
                                                                            
        stockholders' equity:
                                                                            
        preferred stock
                                                                            
        common stock at par, 0.01 par value...
      4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 3,000,000  3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 4,000,000 3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 3,000,000 3,000,000  2,000,000 2,000,000 2,000,000 1,000,000 1,000,000 1,000,000 1,000,000      
        additional capital invested
      8,911,000,000 8,878,000,000 8,855,000,000 8,813,000,000 8,980,000,000 8,945,000,000 9,001,000,000 8,973,000,000 8,992,000,000 8,945,000,000 8,926,000,000 8,986,000,000 8,970,000,000 8,970,000,000 8,953,000,000 9,156,000,000 9,094,000,000 9,042,000,000 8,923,000,000 8,366,000,000 7,383,000,000 7,307,000,000 6,096,000,000 6,129,000,000 6,111,000,000 6,096,000,000 6,080,000,000  6,105,000,000 6,091,000,000 6,077,000,000 6,098,000,000 6,591,000,000 6,577,000,000 6,562,000,000 6,569,000,000 7,974,000,000 7,965,000,000 7,956,000,000 7,946,000,000 7,941,000,000 7,938,000,000 7,932,000,000 7,721,000,000 7,620,000,000 7,636,000,000 7,666,000,000 7,425,000,000 7,410,000,000 7,354,000,000 7,159,000,000 7,140,000,000 7,135,000,000 7,130,000,000 7,110,000,000 7,106,000,000 7,100,000,000  3,001,000,000 2,970,000,000 2,970,000,000 2,666,000,000 2,536,000,000 2,122,000,000 2,106,000,000 2,053,000,000 5,064,000,000 5,066,000,000 5,070,000,000 4,530,000,000 
        stock held in treasury, at cost
      -3,773,000,000 -3,745,000,000 -3,737,000,000 -3,502,000,000 -3,377,000,000 -3,299,000,000 -3,368,000,000 -3,372,000,000 -3,441,000,000 -3,442,000,000 -3,443,000,000 -3,534,000,000 -3,533,000,000 -3,551,000,000 -3,552,000,000 -3,814,000,000 -3,814,000,000 -3,832,000,000 -3,834,000,000 -3,897,000,000 -3,898,000,000 -3,899,000,000 -3,901,000,000 -3,599,000,000 -3,384,000,000 -3,022,000,000 -2,487,000,000  -1,753,000,000 -1,720,000,000 -1,314,000,000 -769,000,000 -1,791,000,000 -1,236,000,000 -816,000,000 -511,000,000 -4,064,000,000 -3,809,000,000 -3,113,000,000 -1,610,000,000 -1,090,000,000 -826,000,000 -576,000,000 -367,000,000 -237,000,000 -47,000,000 -47,000,000 -38,000,000 -38,000,000 -38,000,000 -38,000,000 -32,000,000 -32,000,000 -32,000,000 -31,000,000 -31,000,000 -31,000,000  -28,000,000 -28,000,000 -28,000,000 -26,000,000 -25,000,000 -15,000,000 -15,000,000      
        retained earnings
      10,092,000,000 9,049,000,000 8,110,000,000 7,137,000,000 6,880,000,000 5,896,000,000 4,986,000,000 3,664,000,000 3,831,000,000 2,095,000,000 1,020,000,000 1,265,000,000 421,000,000 -515,000,000 -844,000,000 625,000,000 1,271,000,000 804,000,000 1,239,000,000 2,626,000,000 4,524,000,000 6,365,000,000 7,991,000,000 9,716,000,000 9,075,000,000 8,050,000,000 6,999,000,000 6,668,000,000 6,203,000,000 5,367,000,000 4,684,000,000 4,621,000,000 4,991,000,000 4,354,000,000 3,536,000,000 3,427,000,000 5,323,000,000 4,358,000,000 3,770,000,000 3,457,000,000 2,634,000,000                     -5,199,000,000 -3,896,000,000 467,000,000 132,000,000 16,000,000    1,998,000,000 
        accumulated other comprehensive income
      48,000,000 123,000,000 142,000,000 164,000,000 188,000,000    -62,000,000 103,000,000 161,000,000 175,000,000                             -934,000,000 -812,000,000 -977,000,000 -1,079,000,000 388,000,000 589,000,000  608,000,000       -45,000,000 242,000,000 756,000,000  99,000,000 89,000,000 91,000,000 93,000,000 102,000,000 65,000,000 87,000,000 82,000,000    152,000,000 
        total stockholders' equity
      15,282,000,000 14,309,000,000 13,373,000,000 12,616,000,000 12,675,000,000 11,437,000,000 10,526,000,000 9,188,000,000 9,324,000,000 7,705,000,000 6,668,000,000 6,896,000,000 4,898,000,000 3,964,000,000 3,624,000,000 5,029,000,000 5,431,000,000 4,904,000,000 5,206,000,000 5,960,000,000 7,003,000,000 8,517,000,000 9,418,000,000 11,531,000,000 11,301,000,000 10,320,000,000 9,802,000,000  9,469,000,000 8,639,000,000                                         
        total liabilities and stockholders' equity
      76,448,000,000 76,313,000,000 77,163,000,000 76,111,000,000 74,083,000,000 72,640,000,000 73,254,000,000 71,902,000,000 71,104,000,000 73,341,000,000 70,417,000,000 67,358,000,000 68,968,000,000 70,381,000,000 69,038,000,000 68,175,000,000 69,294,000,000 71,049,000,000 61,662,000,000 59,548,000,000 61,189,000,000 54,901,000,000 53,055,000,000 52,611,000,000 52,199,000,000 52,150,000,000 50,639,000,000  44,837,000,000 44,691,000,000                                         
        assets
                                                                            
        current assets:
                                                                            
        restricted cash
           36,000,000 30,000,000 40,000,000 31,000,000 38,000,000 173,000,000 45,000,000 61,000,000 43,000,000 41,000,000 37,000,000 254,000,000 254,000,000 254,000,000 255,000,000 76,000,000 73,000,000 106,000,000 106,000,000 100,000,000 105,000,000 103,000,000  105,000,000 94,000,000 95,000,000 91,000,000 96,000,000 115,000,000 129,000,000 124,000,000 123,000,000 124,000,000 162,000,000 204,000,000 206,000,000 214,000,000 271,000,000 44,000,000 32,000,000 48,000,000 49,000,000 31,000,000 46,000,000 40,000,000 50,000,000 79,000,000 120,000,000 42,000,000 50,000,000 46,000,000 71,000,000  99,000,000 68,000,000 46,000,000 54,000,000 91,000,000 341,000,000 439,000,000 341,000,000 643,000,000 679,000,000 462,000,000  
        receivables, less allowance for credit losses
           2,042,000,000 2,376,000,000 2,259,000,000 1,898,000,000 2,004,000,000 2,274,000,000 1,801,000,000 2,034,000,000 2,217,000,000 2,062,000,000 1,663,000,000 1,709,000,000 1,793,000,000 1,389,000,000 1,295,000,000 1,171,000,000 857,000,000 792,000,000                                                
        aircraft fuel, spare parts and supplies, less obsolescence allowance
           1,639,000,000 1,680,000,000 1,675,000,000 1,561,000,000 1,290,000,000 1,196,000,000 1,109,000,000 1,116,000,000 1,153,000,000 1,068,000,000 983,000,000 955,000,000 912,000,000 918,000,000 932,000,000 961,000,000 955,000,000 1,070,000,000 1,072,000,000 1,065,000,000 996,000,000 972,000,000  1,011,000,000 942,000,000 924,000,000 924,000,000 937,000,000 882,000,000 900,000,000 873,000,000 842,000,000 798,000,000 759,000,000 738,000,000 704,000,000 656,000,000 631,000,000 666,000,000 700,000,000 685,000,000 641,000,000 667,000,000 646,000,000 555,000,000 690,000,000 675,000,000 611,000,000 645,000,000 628,000,000 508,000,000 619,000,000  216,000,000 228,000,000 228,000,000 237,000,000 283,000,000   218,000,000     
        operating property and equipment:
                                                                            
        flight equipment
           50,933,000,000 49,814,000,000 49,277,000,000 48,448,000,000 45,784,000,000 44,298,000,000 42,775,000,000 40,867,000,000 40,044,000,000 39,733,000,000 39,584,000,000 39,312,000,000 39,109,000,000 38,851,000,000 38,218,000,000 38,167,000,000 37,339,000,000 36,763,000,000 35,421,000,000 34,413,000,000 33,890,000,000 33,705,000,000 1,029,000,000 30,516,000,000 30,143,000,000 29,651,000,000 28,692,000,000 29,043,000,000 28,397,000,000 27,187,000,000 25,873,000,000 25,093,000,000 24,853,000,000 24,348,000,000 23,728,000,000 23,231,000,000 22,555,000,000 21,864,000,000 21,107,000,000 20,367,000,000 19,983,000,000 19,376,000,000 18,786,000,000 18,486,000,000 18,145,000,000 17,888,000,000 16,753,000,000 16,412,000,000 16,035,000,000 15,692,000,000 15,618,000,000 15,552,000,000  8,414,000,000 8,539,000,000 8,521,000,000 8,766,000,000 9,239,000,000 9,212,000,000 9,009,000,000 8,958,000,000 13,443,000,000 14,014,000,000 15,533,000,000 14,888,000,000 
        other property and equipment
           11,865,000,000 11,295,000,000 10,940,000,000 10,527,000,000 9,822,000,000 9,590,000,000 9,334,000,000 9,195,000,000 9,019,000,000 8,941,000,000 8,764,000,000 8,633,000,000 8,683,000,000 8,581,000,000 8,511,000,000 8,470,000,000 8,350,000,000 8,200,000,000 7,926,000,000 7,626,000,000 7,371,000,000 7,165,000,000 7,919,000,000 7,765,000,000 7,481,000,000 7,193,000,000 6,946,000,000 6,186,000,000 6,103,000,000 5,887,000,000 5,652,000,000 5,237,000,000 4,947,000,000 4,715,000,000 4,542,000,000 4,342,000,000 4,220,000,000 4,092,000,000 4,016,000,000 3,934,000,000 3,850,000,000 3,759,000,000 3,687,000,000 3,474,000,000 3,527,000,000 3,357,000,000 3,151,000,000 3,118,000,000 3,066,000,000 3,059,000,000 2,993,000,000 2,921,000,000  1,722,000,000 1,717,000,000 1,732,000,000 1,751,000,000 1,758,000,000 1,536,000,000 1,488,000,000 1,441,000,000 3,837,000,000 3,818,000,000 3,882,000,000 3,714,000,000 
        purchase deposits for flight equipment
           3,414,000,000 3,457,000,000 3,558,000,000 3,550,000,000 3,102,000,000 2,993,000,000 2,820,000,000 2,532,000,000 2,338,000,000 2,260,000,000 2,215,000,000 2,179,000,000 1,980,000,000 1,439,000,000 1,166,000,000 1,174,000,000 1,624,000,000 1,859,000,000 1,360,000,000 1,446,000,000 1,351,000,000 1,455,000,000  1,101,000,000 894,000,000 1,025,000,000 1,344,000,000 1,044,000,000 822,000,000 922,000,000 1,059,000,000 1,068,000,000 919,000,000 866,000,000 788,000,000 736,000,000 951,000,000 602,000,000 706,000,000 734,000,000 799,000,000 688,000,000 706,000,000 674,000,000 610,000,000 534,000,000 613,000,000 450,000,000 418,000,000 359,000,000 304,000,000 269,000,000              
        total operating property and equipment
           66,212,000,000 64,566,000,000 63,775,000,000 62,525,000,000 58,708,000,000 56,881,000,000 54,929,000,000 52,594,000,000 51,401,000,000 50,934,000,000 50,563,000,000 50,124,000,000 49,772,000,000 48,871,000,000 47,895,000,000 47,811,000,000 47,313,000,000 46,822,000,000 44,707,000,000 29,332,000,000 28,918,000,000 28,586,000,000  27,308,000,000 26,946,000,000 26,739,000,000 26,208,000,000 25,629,000,000 25,017,000,000 24,241,000,000                                    
        less — accumulated depreciation and amortization
           -24,532,000,000 -23,901,000,000 -23,305,000,000  -21,580,000,000 -21,044,000,000  -20,088,000,000 -19,548,000,000 -19,053,000,000  -17,996,000,000 -17,441,000,000 -16,956,000,000  -16,161,000,000 -15,578,000,000 -15,011,000,000  -14,153,000,000 -13,694,000,000 -13,739,000,000  -12,487,000,000 -11,974,000,000 -11,538,000,000  -11,358,000,000 -10,894,000,000               -5,846,000,000 -5,638,000,000 -5,305,000,000 -4,750,000,000 -4,482,000,000 -4,191,000,000 -3,717,000,000 -3,421,000,000 -3,131,000,000              
        other assets:
                                                                            
        intangibles, less accumulated amortization
           2,691,000,000 2,699,000,000 2,717,000,000 2,725,000,000 2,744,000,000 2,753,000,000 2,762,000,000 2,772,000,000 2,782,000,000 2,792,000,000 2,803,000,000 2,815,000,000 2,827,000,000 2,840,000,000 2,838,000,000 2,852,000,000 2,852,000,000 2,945,000,000 3,009,000,000 3,114,000,000 3,129,000,000 3,144,000,000  3,382,000,000 3,399,000,000 3,521,000,000 3,539,000,000 3,558,000,000 3,592,000,000 3,612,000,000 3,632,000,000 3,654,000,000 3,677,000,000 4,112,000,000 4,136,000,000 4,193,000,000 4,220,000,000 4,257,000,000 4,284,000,000 4,330,000,000 4,372,000,000 4,402,000,000 4,436,000,000 4,487,000,000 4,523,000,000 4,561,000,000 4,650,000,000 4,681,000,000 4,712,000,000 4,772,000,000 4,815,000,000 4,866,000,000  2,472,000,000 2,507,000,000 2,564,000,000 2,693,000,000 2,726,000,000 2,912,000,000 2,950,000,000 3,028,000,000     
        investments in affiliates and other, less allowance for credit losses
           1,209,000,000 1,337,000,000 1,353,000,000 1,391,000,000 1,403,000,000 1,311,000,000 1,373,000,000 1,285,000,000 1,297,000,000 1,401,000,000  1,336,000,000 1,407,000,000 1,107,000,000                                                    
        total other assets
           8,607,000,000 8,783,000,000 8,841,000,000 8,888,000,000 8,912,000,000 8,975,000,000 8,963,000,000 9,493,000,000 9,717,000,000 9,966,000,000 9,622,000,000 9,412,000,000 9,624,000,000 9,212,000,000 8,745,000,000 8,519,000,000 8,387,000,000 8,486,000,000 9,489,000,000 9,397,000,000 9,414,000,000 9,380,000,000  8,858,000,000 8,864,000,000 8,992,000,000 9,005,000,000 9,059,000,000 9,042,000,000 9,480,000,000                                    
        current liabilities:
                                                                            
        current maturities of long-term debt
           3,279,000,000 4,757,000,000 3,958,000,000 4,018,000,000 3,580,000,000 3,206,000,000 2,911,000,000 2,955,000,000 3,012,000,000 2,994,000,000 3,002,000,000 2,269,000,000 1,881,000,000 1,783,000,000 1,911,000,000 4,584,000,000 4,454,000,000 4,055,000,000 1,407,000,000 1,243,000,000 1,255,000,000 1,201,000,000  910,000,000 887,000,000 1,655,000,000 1,565,000,000 1,516,000,000 1,436,000,000 716,000,000 849,000,000 969,000,000 1,272,000,000 1,295,000,000 1,224,000,000 1,312,000,000 1,047,000,000 1,700,000,000 1,313,000,000 1,340,000,000 1,168,000,000 1,178,000,000 1,368,000,000 957,000,000 909,000,000 1,079,000,000 1,704,000,000 1,349,000,000 1,013,000,000 1,201,000,000 1,389,000,000 2,319,000,000              
        current maturities of finance leases
           87,000,000 110,000,000 117,000,000 172,000,000 225,000,000 75,000,000 104,000,000 72,000,000 78,000,000 64,000,000 76,000,000 116,000,000 144,000,000 179,000,000 182,000,000 136,000,000 93,000,000 59,000,000 46,000,000 92,000,000 117,000,000 133,000,000 149,000,000                                           
        current maturities of other financial liabilities
           69,000,000 68,000,000 63,000,000 57,000,000 35,000,000 29,000,000 23,000,000 906,000,000 914,000,000 1,185,000,000 834,000,000                                                       
        long-term debt
           22,207,000,000 21,687,000,000 23,059,000,000 25,057,000,000 26,713,000,000 27,460,000,000 28,283,000,000 28,490,000,000 29,175,000,000 29,665,000,000 30,361,000,000 31,520,000,000 32,303,000,000 25,849,000,000 24,836,000,000 22,297,000,000 14,318,000,000 13,198,000,000 13,145,000,000 12,900,000,000 12,938,000,000 12,734,000,000  12,218,000,000 12,460,000,000 12,166,000,000 11,703,000,000 11,334,000,000 10,668,000,000 11,178,000,000 9,918,000,000 9,612,000,000 9,275,000,000 9,472,000,000 9,673,000,000 9,910,000,000 9,938,000,000 9,914,000,000 10,121,000,000 9,988,000,000 10,354,000,000 10,098,000,000 10,171,000,000 10,204,000,000 10,214,000,000 10,182,000,000 9,592,000,000 10,128,000,000 10,408,000,000 10,873,000,000 11,101,000,000 11,115,000,000  5,767,000,000 5,604,000,000 5,736,000,000 6,007,000,000 6,145,000,000 7,027,000,000 7,210,000,000 7,453,000,000 1,298,000,000  700,000,000 4,688,000,000 
        long-term obligations under finance leases
           89,000,000 65,000,000 78,000,000 91,000,000 145,000,000 105,000,000 115,000,000 112,000,000 205,000,000 210,000,000 219,000,000 250,000,000 250,000,000 240,000,000 224,000,000 278,000,000 316,000,000 369,000,000 220,000,000 186,000,000 202,000,000 236,000,000 1,134,000,000                                           
        other liabilities and deferred credits:
                                                                            
        pension liability
           1,030,000,000 998,000,000 985,000,000 968,000,000 804,000,000 778,000,000 747,000,000 1,948,000,000 1,934,000,000 1,929,000,000 1,920,000,000 2,180,000,000 2,501,000,000 2,478,000,000 2,460,000,000 2,282,000,000 2,221,000,000 1,514,000,000 1,446,000,000 1,087,000,000 1,366,000,000 1,454,000,000  1,611,000,000 1,815,000,000 1,828,000,000 1,921,000,000 1,631,000,000 1,739,000,000 1,851,000,000 1,892,000,000 1,220,000,000 1,409,000,000 1,469,000,000 1,488,000,000 1,511,000,000 1,468,000,000 2,082,000,000 2,226,000,000 1,517,000,000 1,589,000,000 1,626,000,000 1,650,000,000 1,803,000,000 1,937,000,000 2,385,000,000 1,788,000,000 1,849,000,000 1,857,000,000 1,428,000,000 1,458,000,000 1,465,000,000              
        postretirement benefit liability
           594,000,000 612,000,000 625,000,000 637,000,000 641,000,000 658,000,000 671,000,000 946,000,000 964,000,000 986,000,000 1,000,000,000 961,000,000 988,000,000 1,013,000,000 994,000,000 1,012,000,000 957,000,000 775,000,000 789,000,000 836,000,000 1,277,000,000 1,287,000,000  1,577,000,000 1,585,000,000 1,593,000,000 1,602,000,000 1,588,000,000 1,597,000,000 1,608,000,000 1,581,000,000 1,927,000,000 1,880,000,000 1,879,000,000 1,882,000,000 1,918,000,000 1,927,000,000 1,933,000,000 1,933,000,000 1,684,000,000 1,689,000,000 1,701,000,000 1,703,000,000 2,653,000,000 2,642,000,000 2,632,000,000 2,461,000,000 2,438,000,000 2,415,000,000 2,393,000,000 2,383,000,000 2,366,000,000  1,808,000,000 1,819,000,000 1,813,000,000 1,812,000,000 1,852,000,000 1,934,000,000 1,959,000,000 1,955,000,000 1,932,000,000 1,924,000,000 1,809,000,000 1,557,000,000 
        other financial liabilities
           2,705,000,000 2,576,000,000 2,495,000,000 2,265,000,000 1,468,000,000 1,130,000,000 844,000,000 492,000,000 496,000,000 499,000,000 863,000,000                                                       
        total other liabilities and deferred credits
           11,110,000,000 10,678,000,000 10,296,000,000 9,926,000,000 8,596,000,000 7,980,000,000 7,613,000,000 8,676,000,000 8,596,000,000 8,608,000,000 9,110,000,000 9,995,000,000 10,608,000,000 11,215,000,000 10,817,000,000 10,877,000,000 10,242,000,000 8,923,000,000 7,831,000,000 7,180,000,000 7,578,000,000 7,387,000,000  8,350,000,000 8,461,000,000 8,314,000,000 8,145,000,000 8,206,000,000 8,245,000,000 8,320,000,000                                    
        accumulated other comprehensive loss
           -109,000,000 -97,000,000 -81,000,000     -964,000,000 -944,000,000 -937,000,000 -942,000,000 -1,124,000,000 -1,114,000,000 -1,126,000,000 -1,139,000,000 -1,009,000,000 -1,259,000,000 -771,000,000 -718,000,000 -504,000,000 -807,000,000 -793,000,000  -1,089,000,000 -1,102,000,000 -1,114,000,000 -1,147,000,000 -824,000,000 -844,000,000 -836,000,000 -829,000,000 -798,000,000 -734,000,000 -777,000,000 -831,000,000       580,000,000  -493,000,000 -569,000,000 -1,027,000,000 -319,000,000 -499,000,000 -280,000,000             -36,000,000 -3,288,000,000 -2,663,000,000  
        less—accumulated depreciation and amortization
              -22,710,000,000   -20,481,000,000    -18,489,000,000    -16,429,000,000    -14,537,000,000        -11,159,000,000   -10,403,000,000 -9,975,000,000 -9,529,000,000 -9,148,000,000 -8,743,000,000 -8,339,000,000 -8,038,000,000 -7,726,000,000 -7,399,000,000 -7,079,000,000 -6,894,000,000 -6,665,000,000 -6,364,000,000 -6,080,000,000           -1,932,000,000 -1,817,000,000 -1,698,000,000 -1,598,000,000 -1,458,000,000 -918,000,000 -776,000,000 -503,000,000     
        notes receivable, less allowance for credit losses
                     76,000,000    31,000,000 144,000,000 141,000,000 149,000,000                                                
        other financial liabilities from sale-leasebacks
                      1,406,000,000 1,683,000,000 1,568,000,000 1,140,000,000 957,000,000                                                  
        payroll support program deferred credit
                       1,132,000,000    1,508,000,000                                                 
        receivables, less allowance for doubtful accounts
                             1,364,000,000 1,617,000,000 1,762,000,000 1,789,000,000 1,346,000,000 1,752,000,000 1,840,000,000 1,760,000,000 1,340,000,000 1,603,000,000 1,499,000,000 1,429,000,000 1,176,000,000 1,481,000,000 1,450,000,000 1,581,000,000 1,128,000,000 1,513,000,000 1,471,000,000 1,471,000,000 1,146,000,000 1,559,000,000 1,665,000,000 1,609,000,000 1,503,000,000 1,693,000,000 1,732,000,000 1,679,000,000 1,862,000,000 1,818,000,000 1,908,000,000 1,713,000,000 1,863,000,000 2,357,000,000  843,000,000 921,000,000 738,000,000 714,000,000 1,037,000,000 1,095,000,000 1,138,000,000 820,000,000     
        notes receivable
                             671,000,000 529,000,000 518,000,000 512,000,000                                            
        total operating property and equipment, at cost
                              43,485,000,000 42,612,000,000 42,325,000,000                                            
        less-accumulated depreciation and amortization
                                 -12,760,000,000                                           
        less-accumulated amortization
                                 -654,000,000                                           
        operating lease assets
                                                                            
        owned—
                                                                            
        total owned property and equipment
                                  38,281,000,000 37,624,000,000 36,844,000,000 35,638,000,000 35,229,000,000 34,500,000,000 33,074,000,000                                    
        capital leases—
                                                                            
        total capital leases
                                  1,244,000,000 1,235,000,000 1,216,000,000 1,162,000,000 1,624,000,000 1,467,000,000 1,589,000,000                                    
        less — accumulated amortization
                                  -831,000,000 -833,000,000 -808,000,000  -910,000,000 -878,000,000               -811,000,000 -784,000,000 -747,000,000 -676,000,000 -639,000,000 -602,000,000 -532,000,000 -499,000,000 -462,000,000              
        current maturities of capital leases
                                  136,000,000 117,000,000 124,000,000 128,000,000 125,000,000 115,000,000 113,000,000 116,000,000 124,000,000 128,000,000 114,000,000 135,000,000 137,000,000 111,000,000 112,000,000 110,000,000 99,000,000 98,000,000 112,000,000 117,000,000 117,000,000 119,000,000 121,000,000 120,000,000 119,000,000 127,000,000 138,000,000 138,000,000 148,000,000              
        long-term obligations under capital leases
                                  1,116,000,000 1,039,000,000 1,019,000,000 996,000,000 968,000,000 944,000,000 836,000,000 822,000,000 752,000,000 740,000,000 725,000,000 727,000,000 762,000,000 563,000,000 560,000,000 571,000,000 667,000,000 700,000,000 736,000,000 753,000,000 781,000,000 724,000,000 765,000,000 828,000,000 851,000,000 888,000,000 945,000,000 970,000,000 1,002,000,000  1,212,000,000 1,197,000,000 1,235,000,000 1,192,000,000 1,049,000,000 1,129,000,000 1,330,000,000 1,350,000,000 102,000,000 163,000,000  2,261,000,000 
        lease fair value adjustment
                                  82,000,000 155,000,000 171,000,000 198,000,000 219,000,000 237,000,000 256,000,000 277,000,000 299,000,000 317,000,000 336,000,000 359,000,000 380,000,000 410,000,000 438,000,000 466,000,000 496,000,000 526,000,000 590,000,000 626,000,000 672,000,000 791,000,000 836,000,000 927,000,000 975,000,000 1,062,000,000 1,188,000,000 1,246,000,000               
        liabilities and stockholders’ equity
                                     2,017,000,000    2,016,000,000    2,015,000,000    2,014,000,000    2,013,000,000                       
        stockholders’ equity:
                                                                            
        total stockholders’ equity
                                    8,336,000,000 8,806,000,000 8,970,000,000 8,854,000,000 8,449,000,000                                    
        total liabilities and stockholders’ equity
                                    44,018,000,000 42,326,000,000 42,565,000,000 42,307,000,000 41,445,000,000                                    
        less—accumulated amortization
                                     -777,000,000   -941,000,000 -941,000,000 -959,000,000 -1,025,000,000 -1,008,000,000 -998,000,000 -988,000,000 -931,000,000 -929,000,000 -886,000,000 -862,000,000 -855,000,000 -886,000,000 -849,000,000           -310,000,000 -279,000,000 -252,000,000 -224,000,000 -200,000,000 -151,000,000 -127,000,000 -81,000,000     
        advanced purchase of miles
                                      106,000,000 214,000,000 326,000,000 430,000,000 574,000,000 725,000,000 871,000,000 1,010,000,000 1,070,000,000 1,124,000,000 1,182,000,000 1,217,000,000 1,170,000,000 1,226,000,000 1,282,000,000 1,338,000,000 1,388,000,000 1,438,000,000 1,488,000,000 1,581,000,000 1,624,000,000 1,668,000,000 1,711,000,000 1,545,000,000 1,131,000,000  1,087,000,000 1,087,000,000 1,087,000,000   708,000,000 703,000,000 681,000,000     
        fuel hedge collateral deposits
                                             26,000,000 156,000,000 181,000,000 398,000,000 577,000,000               62,000,000 185,000,000 564,000,000 953,000,000 354,000,000        
        current assets: - sum
                                         7,309,000,000 7,970,000,000 7,844,000,000 7,224,000,000 7,828,000,000 10,097,000,000 8,793,000,000 9,509,000,000                            
        operating property and equipment: - sum
                                         31,525,000,000 30,330,000,000 29,800,000,000 29,063,000,000 28,270,000,000 27,573,000,000 26,775,000,000 25,956,000,000 25,123,000,000 24,301,000,000 23,833,000,000 23,135,000,000 22,473,000,000 21,960,000,000 21,672,000,000 21,245,000,000 19,904,000,000 19,530,000,000 19,101,000,000 18,751,000,000 18,611,000,000 18,473,000,000       10,851,000,000       
        other assets: - sum
                                         9,513,000,000 9,712,000,000 10,244,000,000 11,143,000,000 11,453,000,000 10,596,000,000 9,873,000,000 9,720,000,000 9,748,000,000 9,843,000,000 9,971,000,000 10,013,000,000 10,063,000,000 10,105,000,000 10,263,000,000 10,257,000,000 10,321,000,000 10,409,000,000 10,494,000,000 10,519,000,000 10,613,000,000 10,572,000,000       7,314,000,000       
        fuel derivative instruments
                                          4,000,000 7,000,000 32,000,000 124,000,000 329,000,000 401,000,000 648,000,000 694,000,000                175,000,000 477,000,000          
        current liabilities: - sum
                                         12,286,000,000 13,253,000,000 13,982,000,000 13,380,000,000 12,414,000,000 13,488,000,000 13,810,000,000 13,969,000,000 12,508,000,000 12,864,000,000 13,334,000,000 13,091,000,000 12,107,000,000 12,604,000,000 12,927,000,000 12,892,000,000 13,057,000,000 13,312,000,000 12,486,000,000 11,898,000,000 12,762,000,000 13,874,000,000       7,859,000,000   5,234,000,000 6,112,000,000   
        other liabilities and deferred credits: - sum
                                         8,455,000,000 8,271,000,000 8,695,000,000 8,956,000,000 9,081,000,000 9,154,000,000 10,934,000,000 11,640,000,000 11,757,000,000 10,628,000,000 10,712,000,000 10,681,000,000 10,797,000,000 11,943,000,000 12,386,000,000 12,909,000,000 12,601,000,000 12,768,000,000 12,907,000,000 13,026,000,000 12,919,000,000 12,649,000,000       6,587,000,000   3,252,000,000 7,656,000,000   
        stockholders’ equity: - sum
                                         8,659,000,000 8,439,000,000 7,784,000,000 7,840,000,000 8,966,000,000 8,555,000,000 4,122,000,000 3,008,000,000 2,396,000,000 3,864,000,000 3,347,000,000 2,579,000,000 2,984,000,000 1,728,000,000 1,217,000,000 94,000,000 1,827,000,000 1,635,000,000 1,510,000,000 2,312,000,000 1,942,000,000 1,912,000,000       2,640,000,000       
        accumulated deficit
                                               -2,182,000,000 -3,375,000,000 -3,883,000,000 -3,911,000,000 -4,835,000,000 -5,624,000,000 -5,015,000,000 -5,155,000,000 -5,534,000,000 -6,003,000,000    -4,725,000,000 -5,378,000,000               
        total unrestricted cash, cash equivalents and short-term investments
                                                 4,384,000,000 5,514,000,000 5,796,000,000 5,024,000,000 5,121,000,000 5,736,000,000 5,964,000,000 5,390,000,000 6,680,000,000 7,704,000,000 7,273,000,000 8,357,000,000 8,579,000,000 8,887,000,000              
        retained deficit
                                                         -4,965,000,000 -4,972,000,000 -5,311,000,000   -5,916,000,000  -5,719,000,000 -5,662,000,000 -5,690,000,000      -29,122,000,000 -6,225,000,000 -3,417,000,000  
        restricted cash, cash equivalents and investments
                                                            337,000,000 358,000,000 354,000,000              
        investments
                                                            92,000,000 101,000,000 98,000,000  90,000,000 79,000,000 77,000,000 81,000,000 92,000,000 194,000,000 116,000,000 113,000,000 20,000,000 53,000,000 124,000,000 435,000,000 
        owned —
                                                                            
        capital leases —
                                                                            
        derivatives designated as cash flow hedges
                                                                            
        fuel contracts due within one year
                                                               81,000,000             
        derivatives not designated as cash flow hedges
                                                                            
        prepaid fuel
                                                                285,000,000 311,000,000 223,000,000 219,000,000 524,000,000 418,000,000 414,000,000 283,000,000 258,000,000    
        capital leases:
                                                                            
        aircraft lease deposits
                                                                307,000,000 314,000,000 298,000,000 297,000,000 306,000,000 327,000,000 557,000,000 539,000,000 477,000,000 679,000,000 776,000,000 710,000,000 
        liabilities and stockholders’ deficit
                                                                            
        mileage plus deferred revenue
                                                                1,428,000,000 1,353,000,000 1,371,000,000 1,414,000,000 1,381,000,000 1,201,000,000 1,269,000,000 1,111,000,000     
        accrued salaries, wages and benefits
                                                                731,000,000 728,000,000 767,000,000 756,000,000 785,000,000 823,000,000 818,000,000 795,000,000 844,000,000 2,299,000,000 1,496,000,000 1,508,000,000 
        long-term debt maturing within one year
                                                                651,000,000 846,000,000 818,000,000 782,000,000 749,000,000 654,000,000 601,000,000 1,687,000,000 13,000,000 663,000,000  170,000,000 
        fuel purchase commitments
                                                                285,000,000 311,000,000 223,000,000 219,000,000 524,000,000 418,000,000 414,000,000 283,000,000 258,000,000    
        current obligations under capital leases
                                                                177,000,000 165,000,000 159,000,000 168,000,000 116,000,000 319,000,000 101,000,000 110,000,000 20,000,000 26,000,000  269,000,000 
        accrued interest
                                                                120,000,000 93,000,000 105,000,000 112,000,000 115,000,000 162,000,000 259,000,000 241,000,000     
        derivative instruments
                                                                76,000,000            
        commitments and contingent liabilities
                                                                            
        stockholders’ deficit:
                                                                            
        advances on flight equipment
                                                                     103,000,000 103,000,000 103,000,000 128,000,000 173,000,000 173,000,000 810,000,000 
        fuel derivative payable
                                                                   858,000,000         
        distribution payable
                                                                   4,000,000 4,000,000        
        mandatorily convertible preferred securities
                                                                     366,000,000 366,000,000 361,000,000     
        stockholders’ equity
                                                                            
        aircraft fuel, spare parts and supplies, less
                                                                            
        obsolescence allowance
                                                                     230,000,000 210,000,000  193,000,000 264,000,000 310,000,000 424,000,000 
        capital leases: - sum
                                                                     1,546,000,000       
        deferred pension liability
                                                                     137,000,000 133,000,000 130,000,000 95,000,000 4,747,000,000 4,661,000,000 136,000,000 
        prepaid rent
                                                                       7,000,000 67,000,000 158,000,000 408,000,000 567,000,000 
        liabilities subject to compromise
                                                                        35,016,000,000 13,964,000,000 13,833,000,000  
        predecessor company preferred stock
                                                                            
        successor company preferred stock
                                                                            
        predecessor company esop preferred stock
                                                                            
        predecessor company common stock at par, 0.01 par value...
                                                                            
        successor company common stock at par, 0.01 par value...
                                                                       1,000,000     
        predecessor company stock held in treasury, at cost
                                                                            
        preferred, 10,213,519 depositary shares
                                                                            
        common, 16,121,446 shares
                                                                            
        successor company stock held in treasury, at cost
                                                                       -4,000,000     
        receivables, less allowance for doubtful
                                                                            
        accounts
                                                                        839,000,000 929,000,000 788,000,000 1,216,000,000 
        owned -
                                                                            
        owned - - sum
                                                                        17,408,000,000 18,005,000,000   
        less - accumulated depreciation and amortization
                                                                        -6,106,000,000 5,132,000,000 5,306,000,000 5,583,000,000 
        capital leases -
                                                                            
        capital leases - - sum
                                                                        2,665,000,000 2,720,000,000   
        less - accumulated amortization
                                                                        -739,000,000 555,000,000 494,000,000 640,000,000 
        pension assets
                                                                        4,000,000 904,000,000 1,162,000,000  
        liabilities and stockholders' deficit
                                                                        2,005,000,000    
        other accrued liabilities
                                                                        1,928,000,000 1,293,000,000 1,190,000,000 1,352,000,000 
        stockholders' deficit:
                                                                            
        serial preferred stock
                                                                            
        esop preferred stock
                                                                            
        shares; issued 132,342,405 shares at december 31, 2005 and
                                                                            
        december 31, 2004
                                                                        1,000,000    
        stock held in treasury, at cost - -
                                                                            
        preferred, 10,213,519 depositary shares at december 31,
                                                                            
        2005 and 2004
                                                                        -305,000,000    
        common, 16,121,446 shares at december 31, 2005 and
                                                                            
        income tax receivables
                                                                          326,000,000 110,000,000 
        long-term restricted cash
                                                                          116,000,000  
        preferred stock committed to supplemental esop
                                                                          2,000,000 571,000,000 
        shares; issued 126,498,211 shares at december 31, 2003 and
                                                                            
        98,470,381 shares at december 31, 2002
                                                                         1,000,000   
        2003 and 2002
                                                                         -305,000,000   
        common, 16,083,032 shares at december 31, 2003 and
                                                                            
        16,102,418 shares at december 31, 2002
                                                                         -1,164,000,000   
        notes payable
                                                                            
        accrued aircraft rent
                                                                           840,000,000 
        deferred gains
                                                                           912,000,000 
        company-obligated mandatorily redeemable
                                                                            
        preferred securities of a subsidiary trust
                                                                           99,000,000 
        shares; issued 98,470,381 shares at december 31, 2002 and
                                                                            
        71,266,547 shares at december 31, 2001
                                                                          1,000,000  
        2002 and 2001
                                                                          -305,000,000  
        common, 16,102,418 shares at december 31, 2002 and
                                                                            
        16,282,369 shares at december 31, 2001
                                                                          -1,167,000,000  
        shares; issued 68,834,167 shares at december 31, 2000 and
                                                                            
        65,771,802 shares at december 31, 1999
                                                                           1,000,000 
        unearned esop preferred stock
                                                                            
        stock held in treasury, at cost -
                                                                            
        2000 and 1999
                                                                           -305,000,000 
        common, 16,295,475 shares at december 31, 2000 and
                                                                            
        14,995,219 shares at december 31, 1999
                                                                           -1,179,000,000 
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-09-30 2012-06-30 2012-03-31 2011-09-30 2011-06-30 2011-03-31 2010-06-30 2010-03-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2007-10-08 
                                                                       
          operating activities:
                                                                       
          net income
                                                          6,000,000   653,000,000   289,000,000 -82,000,000      
          adjustments to reconcile net income to net cash from operating activities -
                                                                       
          deferred income tax
                                                                       
          depreciation and amortization
                                                          379,000,000 378,000,000 380,000,000 384,000,000 385,000,000 388,000,000 215,000,000 213,000,000 220,000,000 222,000,000 233,000,000 262,000,000 245,000,000 
          operating and non-operating special charges, non-cash portion
                                                                       
          unrealized losses on investments
                                                                       
          amortization of debt discount and debt issuance costs
                                                                       
          other operating activities
                                                                       
          changes in operating assets and liabilities -
                                                                       
          decrease in receivables
                                                                       
          increase in prepaids and other assets
                                                                       
          increase in advance ticket sales
                                                          -818,000,000 234,000,000 1,319,000,000 -737,000,000 173,000,000 1,326,000,000 297,000,000 511,000,000 -241,000,000 148,000,000 238,000,000 -721,000,000 -411,000,000 
          increase in frequent flyer deferred revenue
                                                                       
          increase in accounts payable
                                                          16,000,000 -77,000,000 230,000,000 -201,000,000          
          increase in other liabilities
                                                                       
          net cash from operating activities
        1,286,000,000 1,218,000,000 2,217,000,000 3,710,000,000 2,224,000,000 1,498,000,000 2,876,000,000 2,847,000,000 3,799,000,000 3,142,000,000 1,158,000,000 741,000,000 2,691,000,000 1,476,000,000 -269,000,000 -786,000,000 2,675,000,000 447,000,000 -2,177,000,000   63,000,000 1,181,000,000 1,103,000,000 2,710,000,000 1,915,000,000 1,101,000,000 905,000,000 2,442,000,000 1,733,000,000 728,000,000 577,000,000 1,561,000,000 547,000,000 658,000,000 1,138,000,000 2,547,000,000 1,199,000,000 1,115,000,000 1,300,000,000 1,752,000,000 1,825,000,000 -98,000,000 574,000,000 1,464,000,000 694,000,000 -334,000,000 237,000,000 1,148,000,000 393,000,000 -238,000,000 959,000,000 124,000,000 385,000,000 753,000,000 1,005,000,000        
          investing activities:
                                                                       
          capital expenditures, net of flight equipment purchase deposit returns
        -1,890,000,000 -1,464,000,000 -1,287,000,000 -1,233,000,000 -1,675,000,000 -1,410,000,000 -1,164,000,000 -1,366,000,000 -1,420,000,000 -1,843,000,000 -2,539,000,000 -1,328,000,000 -550,000,000 -402,000,000 -536,000,000 -266,000,000                                                
          purchases of short-term and other investments
        -1,309,000,000 -1,732,000,000 -2,476,000,000 -2,246,000,000 -1,752,000,000 -2,303,000,000 -888,000,000 -866,000,000 -2,683,000,000 -4,193,000,000 -2,848,000,000 -5,082,000,000 -3,146,000,000 -156,000,000 -21,000,000    -2,000,000 -9,000,000 -541,000,000 -729,000,000 -725,000,000 -719,000,000 -724,000,000 -577,000,000 -649,000,000 -730,000,000 -596,000,000 -657,000,000 -997,000,000 -813,000,000 -774,000,000 -779,000,000 -716,000,000 -635,000,000 -638,000,000 -658,000,000 -657,000,000 -1,005,000,000 -197,000,000                      
          proceeds from sale of short-term and other investments
        1,630,000,000 1,432,000,000 2,199,000,000 2,023,000,000 1,455,000,000 1,386,000,000 2,163,000,000 3,657,000,000 2,641,000,000 4,061,000,000 1,023,000,000 846,000,000 153,000,000 62,000,000 126,000,000   105,000,000 137,000,000 408,000,000 847,000,000 927,000,000 714,000,000 798,000,000 716,000,000 768,000,000 637,000,000 524,000,000 615,000,000 840,000,000 797,000,000 819,000,000 751,000,000 810,000,000 755,000,000 693,000,000 611,000,000 653,000,000 638,000,000 672,000,000 1,071,000,000 326,000,000                      
          proceeds from sale of property and equipment
        35,000,000 15,000,000 19,000,000 29,000,000 43,000,000 24,000,000 22,000,000 20,000,000 8,000,000 1,000,000 23,000,000 46,000,000 72,000,000 66,000,000              10,000,000 17,000,000 3,000,000 4,000,000 3,000,000 1,000,000 4,000,000 4,000,000 5,000,000 2,000,000 17,000,000 36,000,000 14,000,000 19,000,000 17,000,000 21,000,000 30,000,000 8,000,000 35,000,000 87,000,000 48,000,000 8,000,000 9,000,000 1,000,000 56,000,000 89,000,000 53,000,000 15,000,000 39,000,000        
          other
        -32,000,000 6,000,000 -35,000,000 -35,000,000 214,000,000 -208,000,000 1,000,000 -4,000,000 -5,000,000 6,000,000 -46,000,000 -10,000,000   -24,000,000 12,000,000 1,000,000 10,000,000 -4,000,000 13,000,000 1,000,000 89,000,000 -27,000,000 5,000,000 12,000,000 61,000,000 87,000,000 5,000,000 2,000,000 -22,000,000 19,000,000 115,000,000 8,000,000 53,000,000 -16,000,000 -25,000,000 1,000,000 -45,000,000 -14,000,000 18,000,000 19,000,000 3,000,000 26,000,000 1,000,000 7,000,000 36,000,000 67,000,000 -12,000,000 -33,000,000 45,000,000 44,000,000 23,000,000 6,000,000 170,000,000 -64,000,000 317,000,000 -118,000,000 10,000,000 15,000,000 -95,000,000 -272,000,000 -254,000,000 
          net cash from investing activities
        -1,565,000,000 -1,743,000,000 -1,580,000,000 -1,462,000,000 -1,715,000,000 -2,511,000,000 134,000,000 1,441,000,000 -1,459,000,000 -1,968,000,000 -4,387,000,000 -5,528,000,000 -3,484,000,000 -430,000,000 -348,000,000 -214,000,000 -781,000,000 -329,000,000 40,000,000 770,000,000 812,000,000 -1,572,000,000 -1,329,000,000 -795,000,000 -856,000,000 -1,580,000,000 -1,960,000,000 -886,000,000 -987,000,000 -730,000,000 -976,000,000 -1,276,000,000 -1,035,000,000 -643,000,000 -956,000,000 -663,000,000 -822,000,000 -797,000,000 -774,000,000 -546,000,000 -1,128,000,000 -45,000,000 -626,000,000 -298,000,000 -905,000,000 -427,000,000 -723,000,000 -466,000,000 -402,000,000 -431,000,000 -230,000,000 -213,000,000 -362,000,000 -453,000,000 -509,000,000 -320,000,000        
          financing activities:
                                                                       
          proceeds from issuance of debt and other financial liabilities, net of discounts and fees
        93,000,000   -3,000,000                                                            
          payments of long-term debt, finance leases and other financial liabilities
        -575,000,000 -2,585,000,000 -600,000,000 -1,011,000,000                                                            
          repurchases of common stock
        -27,000,000 -21,000,000 -240,000,000 -349,000,000               -353,000,000 -214,000,000 -369,000,000 -549,000,000 -513,000,000 -225,000,000 -41,000,000 -440,000,000 -529,000,000 -553,000,000 -579,000,000 -454,000,000 -258,000,000 -172,000,000 -260,000,000 -790,000,000 -1,392,000,000 -523,000,000 -265,000,000 -250,000,000 -195,000,000 -92,000,000                     
          net cash from financing activities
        -509,000,000 -2,136,000,000 -843,000,000 -1,457,000,000 -591,000,000 -1,073,000,000 -580,000,000 -1,938,000,000 -491,000,000 -563,000,000 -877,000,000 -818,000,000 -798,000,000 -856,000,000 -575,000,000 -583,000,000 6,276,000,000 1,278,000,000 481,000,000    -47,000,000 -571,000,000 -479,000,000 -183,000,000 -68,000,000 -284,000,000   -140,000,000 177,000,000   -235,000,000 -328,000,000 -1,037,000,000 -1,613,000,000 -762,000,000 -123,000,000 -1,180,000,000 -430,000,000 -391,000,000 -583,000,000 -144,000,000 -478,000,000 342,000,000 21,000,000 -141,000,000 -1,194,000,000 -489,000,000 -266,000,000 -402,000,000 -467,000,000 -890,000,000 -589,000,000        
          net increase in cash, cash equivalents and restricted cash
        -790,000,000 -2,660,000,000 -206,000,000 791,000,000 -82,000,000 -2,086,000,000 2,430,000,000 2,350,000,000 1,849,000,000 611,000,000 -4,106,000,000 -5,605,000,000 -1,591,000,000 190,000,000 -1,192,000,000 -1,583,000,000 8,170,000,000 1,396,000,000 -1,656,000,000 6,786,000,000 3,064,000,000 680,000,000 -195,000,000 -263,000,000 1,375,000,000 152,000,000 -927,000,000 -265,000,000 481,000,000 919,000,000                                  
          cash, cash equivalents and restricted cash at beginning of year
                                                                       
          cash, cash equivalents and restricted cash at end of year
                                                                       
          investing and financing activities not affecting cash:
                                                                       
          right-of-use assets acquired or modified through operating leases
        519,000,000 409,000,000 554,000,000 419,000,000                                                            
          property and equipment acquired through the issuance or modification of debt, finance leases and other financial liabilities
        27,000,000 -51,000,000 -1,000,000                                                            
          operating leases converted to finance leases
                                                                      
          investment interests received in exchange for loans, goods and services
        29,000,000 2,000,000    18,000,000                                                        
          cash paid during the period for:
                                                                       
          interest
                                                                       
          income taxes
                                                                       
          cash, cash equivalents and restricted cash at beginning of the period
         8,946,000,000  -1,000,000 6,335,000,000 7,421,000,000  18,533,000,000  11,742,000,000  2,868,000,000  1,799,000,000  1,591,000,000  2,303,000,000                              
          cash, cash equivalents and restricted cash at end of the period
         -2,660,000,000 -206,000,000 9,737,000,000  -2,086,000,000 2,429,000,000 8,685,000,000 1,849,000,000 8,032,000,000  -5,605,000,000 -1,591,000,000 18,723,000,000  -1,583,000,000 8,170,000,000 13,138,000,000  6,786,000,000 3,064,000,000 3,548,000,000  -263,000,000 1,375,000,000 1,951,000,000  -265,000,000 481,000,000 2,510,000,000  -522,000,000 208,000,000 2,293,000,000                              
          property and equipment acquired through the issuance of debt, finance leases and other
            565,000,000 47,000,000   359,000,000 200,000,000     13,000,000 40,000,000 252,000,000 509,000,000 455,000,000                                             
          right-of-use assets acquired through operating leases
            201,000,000 233,000,000 11,000,000 132,000,000 139,000,000 295,000,000 39,000,000 14,000,000 16,000,000 68,000,000 144,000,000 413,000,000 34,000,000 180,000,000 134,000,000 16,000,000 18,000,000 30,000,000 154,000,000 245,000,000 48,000,000 51,000,000                                      
          lease modifications and lease conversions
            173,000,000 44,000,000 59,000,000 14,000,000 326,000,000 23,000,000 -145,000,000 -21,000,000 23,000,000 59,000,000 12,000,000 52,000,000 37,000,000 22,000,000 24,000,000 33,000,000 31,000,000 439,000,000                                          
          investment interests received in exchange for goods and services
                4,000,000 21,000,000 10,000,000                                                     
          cash flows from operating activities:
                                                                       
          cash flows from investing activities:
                                                                       
          cash flows from financing activities:
                                                                       
          proceeds from issuance of debt and other financing liabilities, net of discounts and fees
             1,584,000,000 607,000,000 3,111,000,000 1,303,000,000 288,000,000                                                      
          payments of long-term debt, finance leases and other financing liabilities
             -2,575,000,000 -1,186,000,000 -5,031,000,000 -1,794,000,000 -820,000,000 -1,406,000,000 -810,000,000 -1,012,000,000 -783,000,000 -573,000,000 -560,000,000 -3,503,000,000 -569,000,000                                              
          repurchase of common stock
                                                                       
          increase in receivables
                                                          -32,000,000 25,000,000 -427,000,000 -130,000,000 -8,000,000 -379,000,000   8,000,000 -4,000,000 -48,000,000  47,000,000 
          proceeds from equity issuance
                      532,000,000 968,000,000                                            
          decrease in other assets
                                                                       
          proceeds from issuance of debt, net of discounts and fees
                  526,000,000 -2,000,000   -2,000,000 -18,000,000 9,780,000,000 1,336,000,000                                              
          cash paid (refunded) during the period for:
                                                                       
          equity investment interest received in exchange for aircraft
                                                                       
          notes receivable and warrants received for entering into agreements
                                                                       
          equity interest received in consideration for the sale of aircraft
                     42,000,000                                                  
          warrants received for entering into ancillary business agreements
                                                                       
          decrease in other liabilities
                                                           384,000,000 -470,000,000           
          loans made to others
                                                                       
          equity interest in avianca group international limited ("avg") received in consideration for a loan
                                                                       
          notes receivable and warrants received for entering into aircraft and other ancillary business agreements
                      2,000,000                                                 
          purchases of short-term investments
                                                             -311,000,000 -334,000,000 -109,000,000        
          proceeds from sale of short-term investments
                                                                       
          capital expenditures
        -444,000,000   -1,959,000,000 -1,192,000,000 -869,000,000 -858,000,000 -1,609,000,000 -1,585,000,000 -858,000,000 -755,000,000 -979,000,000 -1,098,000,000 -1,120,000,000 -1,089,000,000 -691,000,000 -880,000,000 -689,000,000 -838,000,000 -816,000,000 -763,000,000 -673,000,000 -1,101,000,000 -210,000,000 -660,000,000 -392,000,000 -589,000,000 -364,000,000 -222,000,000 -286,000,000 -266,000,000 -160,000,000 -145,000,000 -205,000,000        
          free cash flows
        1,286,000,000 1,218,000,000 2,217,000,000 3,710,000,000 2,224,000,000 1,498,000,000 2,876,000,000 2,847,000,000 3,799,000,000 3,142,000,000 1,158,000,000 741,000,000 2,691,000,000 1,476,000,000 -269,000,000 -786,000,000 2,675,000,000 3,000,000 -2,177,000,000   -1,896,000,000 -11,000,000 234,000,000 1,852,000,000 306,000,000 -484,000,000 47,000,000 1,687,000,000 754,000,000 -370,000,000 -543,000,000 472,000,000 -144,000,000 -222,000,000 449,000,000 1,709,000,000 383,000,000 352,000,000 627,000,000 651,000,000 1,615,000,000 -758,000,000 182,000,000 875,000,000 330,000,000 -334,000,000 237,000,000 1,148,000,000 393,000,000 -460,000,000 673,000,000 -142,000,000 225,000,000 608,000,000 800,000,000        
          warrants received for entering into agreements with archer aviation inc
                         81,000,000                                              
          investment in affiliates
                              -9,000,000 -27,000,000                                   
          proceeds from issuance of debt
                          3,020,000,000                                             
          payments of long-term debt
                          -3,419,000,000 -441,000,000 -288,000,000 -235,000,000 -514,000,000 -253,000,000 -223,000,000 -250,000,000 -208,000,000 -225,000,000 -1,105,000,000 -189,000,000 -179,000,000 -197,000,000 -210,000,000 -315,000,000 -304,000,000 -458,000,000 -226,000,000 -227,000,000 -650,000,000 -209,000,000 -1,023,000,000 -296,000,000 -502,000,000 -1,089,000,000 -299,000,000 -613,000,000 -220,000,000 -228,000,000 -496,000,000 -1,241,000,000 -462,000,000 -217,000,000 -479,000,000 -448,000,000 -949,000,000 -528,000,000        
          principal payments under finance leases
                          -13,000,000 -12,000,000 -23,000,000 -18,000,000 -46,000,000 -42,000,000 -43,000,000 -20,000,000                                      
          capitalized financing costs
                          -74,000,000 -246,000,000 -13,000,000 -35,000,000 -10,000,000 -21,000,000 -13,000,000 -17,000,000                                      
          capacity purchase agreement liability converted to debt
                                                                       
          debt associated with termination of a maintenance service agreement
                                                                       
          capital expenditures, net of returns of purchase deposits on flight equipment
                           368,000,000                                            
          net cash provided (used) by operating activities
                                                                       
          proceeds from issuance of short-term debt
                            250,000,000 2,500,000,000                                          
          proceeds from issuance of long-term debt
                            1,321,000,000 348,000,000 738,000,000 113,000,000 350,000,000 646,000,000       384,000,000 755,000,000 298,000,000 435,000,000 33,000,000 42,000,000 460,000,000 385,000,000 128,000,000 100,000,000 255,000,000 782,000,000 248,000,000 147,000,000 604,000,000 299,000,000 411,000,000 109,000,000 86,000,000 110,000,000 32,000,000 686,000,000 1,309,000,000 187,000,000 134,000,000   
          net cash provided (used) in financing activities
                            2,382,000,000 2,189,000,000        -84,000,000    86,000,000                              
          property and equipment acquired through the issuance of debt
                            218,000,000 109,000,000 187,000,000 86,000,000 128,000,000 92,000,000        711,000,000 271,000,000 56,000,000 59,000,000 69,000,000      283,000,000 375,000,000    146,000,000 185,000,000 205,000,000 136,000,000 33,000,000 33,000,000 64,000,000        
          property and equipment acquired through other financial liabilities
                                                                       
          property and equipment acquired through finance leases
                            19,000,000  8,000,000                                      
          deferred income taxes
                                                                     3,000,000  
          special charges, non-cash portion
                                                            12,000,000   4,000,000        
          decrease in advanced purchase of miles
                                                                       
          property and equipment acquired through finance lease
                                                                       
          investment in republic airways holdings inc. received from bankruptcy claims
                                                                       
          loans made to affiliates
                                                                       
          operating lease conversions to finance lease
                               36,000,000                                      
          proceeds from issuance of long-term debt and airport construction financing
                                  408,000,000 24,000,000 612,000,000 696,000,000 646,000,000                                 
          principal payments under capital leases
                                  -36,000,000 -36,000,000 -32,000,000 -30,000,000 -40,000,000 -25,000,000 -28,000,000 -31,000,000 -41,000,000 -29,000,000 -32,000,000 -34,000,000 -43,000,000 -27,000,000 -29,000,000 -24,000,000 -46,000,000 -23,000,000 -34,000,000 -24,000,000 -36,000,000 -25,000,000 -44,000,000 -29,000,000 -25,000,000 -41,000,000 -23,000,000 -23,000,000 -51,000,000 -125,000,000 -66,000,000 -27,000,000 -26,000,000 -55,000,000 -48,000,000 -26,000,000 -12,000,000 
          property and equipment acquired through the issuance of debt and capital leases
                                  35,000,000 65,000,000 74,000,000 17,000,000 11,000,000         177,000,000 599,000,000                      
          investment in republic airways holdings, inc. received from bankruptcy claims
                                                                       
          airport construction financing
                                  12,000,000 1,000,000 9,000,000 11,000,000 21,000,000 23,000,000 33,000,000 26,000,000 9,000,000 12,000,000     3,000,000 9,000,000 2,000,000   24,000,000 5,000,000              
          operating lease conversions to capital lease
                                         5,000,000 7,000,000                         
          (a) the following table provides a reconciliation of cash, cash equivalents and restricted cash to amounts reported within the consolidated balance sheet:
                                                                       
          reconciliation of cash, cash equivalents and restricted cash:
                                                                       
          current assets:
                                                                       
          cash and cash equivalents
                                     2,404,000,000                                  
          restricted cash included in prepaid expenses and other
                                     11,000,000                                  
          other assets:
                                                                       
          restricted cash
                                     95,000,000                                  
          total cash, cash equivalents and restricted cash
                                     2,510,000,000                                  
          decrease in fuel hedge collateral
                                                                -3,000,000 7,000,000  385,000,000 395,000,000   
          decrease in fuel derivatives
                                                                       
          increase in other assets
                                                                       
          proceeds from the exercise of stock options
                                                                       
          equity interest in republic airways holdings, inc. received in consideration for bankruptcy claims
                                                                       
          exchange of convertible notes for common stock
                                                                       
          investment in and loans to affiliates
                                             -40,000,000                          
          net decrease in cash, cash equivalents and restricted cash
                                         -10,000,000                              
          increase in fuel derivatives
                                                                       
          decrease in frequent flyer deferred revenue and advanced purchase of miles
                                                                       
          decrease in restricted cash
                                           43,000,000 13,000,000 26,000,000     -4,000,000 35,000,000 38,000,000 6,000,000 17,000,000 23,000,000 12,000,000    16,000,000 -11,000,000 -9,000,000 33,000,000 10,000,000  3,000,000 17,000,000 -24,000,000  
          net increase in cash and cash equivalents
                                           147,000,000 688,000,000 -1,211,000,000 -421,000,000 631,000,000 -556,000,000 1,350,000,000                      
          cash and cash equivalents at beginning of the period
                                           3,006,000,000  2,002,000,000  3,220,000,000  4,770,000,000 6,246,000,000 8,069,000,000   2,039,000,000  
          cash and cash equivalents at end of the period
                                           147,000,000 688,000,000 1,795,000,000  631,000,000 -556,000,000 3,352,000,000  -307,000,000 415,000,000 3,009,000,000  -208,000,000 605,000,000 3,538,000,000 -957,000,000 480,000,000 5,606,000,000 -535,000,000 -646,000,000 8,165,000,000 1,384,000,000 3,516,000,000 -41,000,000 109,000,000 2,457,000,000  -404,000,000 
          exchanges of certain convertible notes for common stock
                                               201,000,000  202,000,000                  
          unrealized loss on fuel derivatives
                                                                       
          decrease in accounts payable
                                                                       
          cash and cash equivalents at beginning of year
                                                                       
          cash and cash equivalents at end of year
                                                                       
          adjustments to reconcile net income to net cash provided (used) by operating activities -
                                                                       
          increase in fuel hedge collateral
                                                            -1,000,000         -587,000,000  
          unrealized loss on fuel derivatives and change in related pending settlements
                                                                       
          redemptions of short-term and other investments
                                                                       
          net decrease in cash and cash equivalents
                                                  -1,115,000,000   -211,000,000 -715,000,000 -208,000,000                
          increase in short-term and other investments
                                                   3,000,000 -363,000,000 -111,000,000 -98,000,000 19,000,000 36,000,000 -77,000,000 74,000,000 52,000,000 -148,000,000           
          debt discount and lease fair value amortization
                                                                       
          amortization of capitalized financing costs
                                                                       
          pension and postretirement amortization
                                                                       
          share-based compensation
                                                                       
          proceeds from exercise of stock options
                                                                       
          purchases of treasury stock
                                                                       
          capital expenditures and aircraft purchase deposits paid
                                                       -578,000,000 -446,000,000 -375,000,000              
          exchanges of certain 6% convertible senior notes for common stock
                                                       51,000,000                
          net property and equipment acquired through the issuance of debt
                                                       14,000,000                
          special facility and airport construction financing
                                                                       
          8% contingent senior unsecured notes, net of discount
                                                                      
          net decrease in cash and cash equivalents during the period
                                                         -1,232,000,000 -957,000,000             
          adjustments to reconcile net income to net cash provided (used) by operating activities —
                                                                       
          debt and lease discount amortization
                                                          -45,000,000 -81,000,000 -70,000,000           
          special items, non-cash portion
                                                          9,000,000   33,000,000          
          increase in frequent flyer deferred revenue and advanced purchase of miles
                                                            -136,000,000           
          increase in other current assets
                                                          -108,000,000 -56,000,000 -288,000,000 42,000,000          
          aircraft purchase deposits paid
                                                          -186,000,000 -32,000,000 -35,000,000 -51,000,000 -32,000,000 -38,000,000        
          special facility payment financing
                                                                       
          reclassification of debt to advanced purchases of miles
                                                                      
          reclassification of debt discount to other assets
                                                                      
          interest paid in kind on ual 6% senior notes
                                                                      
          increase in restricted cash
                                                           -3,000,000 -2,000,000           
          houston bush intercontinental airport terminal b construction obligation
                                                                       
          net loss
                                                            -448,000,000   -213,000,000   -57,000,000 28,000,000 -382,000,000   
          adjustments to reconcile net loss to net cash provided (used) by operating activities —
                                                                       
          net increase in cash and cash equivalents during the period
                                                            -640,000,000           
          amortization of debt and lease fair value adjustment
                                                             -52,000,000          
          increase in other accrued liabilities
                                                             248,000,000          
          net change in fuel hedge cash collateral
                                                             -32,000,000 -207,000,000 178,000,000        
          increase in cash and cash equivalents during the period
                                                             -535,000,000 -646,000,000 96,000,000 1,390,000,000 474,000,000 -41,000,000 109,000,000 418,000,000 -892,000,000  
          ual 8% contingent senior unsecured notes, net of discount
                                                                       
          increase in accrued wages and liabilities
                                                               -235,000,000        
          cash flows provided (used) by operating activities:
                                                                       
          adjustments to reconcile to net cash provided (used) by operating activities—
                                                                       
          unrealized gain/loss on fuel derivatives and change in related pending settlements
                                                                       
          asset impairments and special items
                                                                72,000,000 18,000,000   119,000,000   
          increase in mileage plus deferred revenue and advanced purchase of miles
                                                                -43,000,000 -17,000,000 11,000,000 37,000,000 92,000,000   
          proceeds from lease amendment
                                                                  160,000,000   
          cash flows provided (used) by investing activities:
                                                                       
          additions to property, equipment and deferred software
                                                                -73,000,000 -51,000,000 -60,000,000 -91,000,000 -79,000,000   
          advance deposits on aircraft
                                                                -42,000,000      
          proceeds from asset dispositions
                                                                21,000,000 4,000,000      
          proceeds from asset sale-leasebacks
                                                                       
          cash flows provided (used) by financing activities:
                                                                       
          repayment of debt
                                                                -69,000,000 -1,204,000,000      
          increase in deferred financing costs
                                                                -19,000,000 -7,000,000 -5,000,000     
          capital contribution from parent
                                                                       
          decrease in lease deposits
                                                                  22,000,000   
          cash and cash equivalents at beginning of the year
                                                                -6,000,000 3,042,000,000      
          adjustments to reconcile to net cash provided (used) by operating activities —
                                                                       
          net change in fuel derivative instruments and related pending settlements
                                                                 -50,000,000 -61,000,000 -523,000,000 -286,000,000   
          proceeds from issuance of common stock
                                                                  27,000,000 63,000,000   
          goodwill impairment
                                                                      
          other impairments and special items
                                                                  43,000,000     
          (increase) decrease in fuel hedge collateral
                                                                       
          net sales of short-term investments
                                                                       
          (increase) decrease in restricted cash
                                                                      83,000,000 
          proceeds from litigation on advance deposits
                                                                       
          repayment of credit facility
                                                                  -9,000,000 -9,000,000 -9,000,000 
          repayment of other debt
                                                                  -229,000,000 -157,000,000 -229,000,000   
          special distribution to common shareholders
                                                                      
          proceeds from asset sale-leaseback
                                                                   94,000,000   
          proceeds from disposition of property and equipment
                                                                   13,000,000 33,000,000   
          net income before reorganization items
                                                                      334,000,000 
          mileage plus deferred revenue and advanced purchase of miles
                                                                      17,000,000 
          pension expense, net of contributions
                                                                       
          postretirement benefit expense, net of contributions
                                                                       
          gain on sale of investments
                                                                       
          changes in assets and liabilities—
                                                                       
          increase in fuel derivative payables
                                                                       
          increase in accrued liabilities
                                                                       
          decrease in other current assets
                                                                       
          cash flows provided (used) by reorganization activities:
                                                                       
          reorganization items
                                                                       
          discharge of claims and liabilities
                                                                       
          revaluation of mileage plus frequent flyer deferred revenue
                                                                       
          revaluation of other assets and liabilities
                                                                       
          increase in non-aircraft claims accrual
                                                                       
          pension curtailment, settlement and employee claims
                                                                       
          net (purchases) sales of short-term investments
                                                                      
          additions to property and equipment
                                                                     -80,000,000 -282,000,000 
          additions to deferred software costs
                                                                       
          proceeds on disposition of property and equipment
                                                                       
          proceeds on litigation of advanced deposits
                                                                       
          proceeds on sale of investments
                                                                       
          purchases of eetc securities
                                                                       
          decrease in segregated funds
                                                                       
          proceeds from credit facility
                                                                       
          repayment of other long-term debt
                                                                      -126,000,000 
          decrease in aircraft lease deposits
                                                                       
          payment of deferred financing costs
                                                                       
          proceeds from sale of common stock
                                                                       
          repayment of dip financing
                                                                       
          cash and cash equivalents at beginning of period
                                                                       
          cash and cash equivalents at end of period
                                                                       
          other impairments
                                                                       
          increase in advanced purchase of miles
                                                                       
          increase in mileage plus deferred revenue
                                                                       
          proceeds from asset sale leaseback
                                                                       
          proceeds from the sale of property and equipment
                                                                       
          proceeds from issuance of secured notes
                                                                       
          decrease in capital lease deposits
                                                                       
          increase in deferred income taxes
                                                                       
          cash flows provided (used) by operating activities: - sum
                                                                       
          cash flows provided (used) by investing activities: - sum
                                                                       
          proceeds from secured notes
                                                                      
          cash flows provided (used) by financing activities: - sum
                                                                       
          increase (decrease) in cash and cash equivalents during the period
                                                                      -404,000,000 
          (increase) decrease in short-term investments
                                                                       
          mileage plus deferred revenue
                                                                       
          special items and debt discount amortization
                                                                       
          pension expense (benefit), net of contributions
                                                                       
          amortization of deferred gains
                                                                       
          decrease (increase) in receivables
                                                                       
          decrease (increase) in other current assets
                                                                       
          increase (decrease) in accounts payable
                                                                       
          increase (decrease) in accrued liabilities and accrued aircraft rent
                                                                       
          increase in aircraft rejection liability
                                                                       
          impairment on lease certificates
                                                                       
          increase (decrease) in other liabilities
                                                                       
          loss on disposition of property
                                                                       
          sale of mypoints.com inc.
                                                                       
          proceeds from dip financing
                                                                       
          aircraft lease deposits
                                                                       
          net loss before reorganization items
                                                                       
          adj to reconcile to net cash provided (used) by operating
                                                                       
          activities -
                                                                       
          frequent flyer deferred revenue
                                                                       
          pension funding less than expense
                                                                       
          postretirement benefit expense
                                                                       
          undistributed (earnings) of affiliates
                                                                       
          increase in accrued income taxes
                                                                       
          increase in accrued aircraft rent
                                                                       
          pension curtailment, settlement and termination
                                                                       
          cash flows provided (used) by reorganization activities: - sum
                                                                       
          decrease in short-term investments
                                                                       
          repayment of long-term debt
                                                                       
          increase in cash and cash equivalents during the year
                                                                       
          cash flows from (utilized by) operating activities:
                                                                       
          adj to reconcile to net cash from operating activities -
                                                                       
          cumulative effect of accounting change, net of tax
                                                                       
          pension funding less than (greater than) expense
                                                                       
          deferred postretirement benefit expense
                                                                       
          provision (credit) for deferred income taxes
                                                                       
          undistributed losses of affiliates
                                                                       
          increase in accounts payable and accrued liabilities
                                                                       
          cash flows from (utilized by) reorganization activities:
                                                                       
          transfer of company lease certificates
                                                                       
          increase in liabilities
                                                                       
          cash flows from (utilized by) investing activities:
                                                                       
          acquisition of mypoints.com, net of cash acquired
                                                                       
          cash flows from (utilized by) investing activities: - sum
                                                                       
          decrease in equipment certificates under company leases
                                                                       
          increase in short-term borrowings
                                                                       
          cash dividends
                                                                       
          cash flows from financing activities: - sum
                                                                       
          net earnings
                                                                       
          adjustments to reconcile to net cash from
                                                                       
          operating activities -
                                                                       
          esop compensation expense
                                                                       
          extraordinary loss on debt extinguishment, net of tax
                                                                       
          investment impairment
                                                                       
          provision for deferred income taxes
                                                                       
          undistributed (earnings) losses of affiliates
                                                                       
          and accrued liabilities
                                                                       
          reacquisition of preferred stock
                                                                       
          purchase of equipment certificates under company leases