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Revenue Recognition - Revenue Recognized By Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Passenger revenue |  |  |
Passenger travel | $ 8,403 | $ 8,078 | $ 5,304
Loyalty revenue - air transportation | 605 | 508 | 305
Other revenue |  |  |
Loyalty revenue | 422 | 391 | 306
Other revenue | 185 | 181 | 122
Total operating revenue | $ 9,615 | $ 9,158 | $ 6,037

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