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REVENUE RECOGNITION - Passenger Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Passenger revenue | $ 16,648 | $ 16,658 | $ 30,688 | $ 30,406
Passenger |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Passenger revenue | 13,867 | 13,841 | 25,347 | 24,972
Ticket |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Passenger revenue | 12,246 | 12,349 | 22,314 | 22,182
Loyalty travel awards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Passenger revenue | 1,092 | 975 | 2,033 | 1,820
Travel-related services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Passenger revenue | $ 529 | $ 517 | $ 1,000 | $ 970

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