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Revenue Recognition - Revenue Recognized By Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Revenue from Contract with Customer [Abstract] |  |  |  |
Passenger travel | $ 1,998 | $ 2,085 | $ 3,792 | $ 3,972
Loyalty revenue - air transportation | 181 | 180 | 357 | 347
Loyalty revenue | 128 | 114 | 249 | 221
Other revenue | 49 | 49 | 98 | 97
Total operating revenue | $ 2,356 | $ 2,428 | $ 4,496 | $ 4,637

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