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REVENUE FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cargo and Other Revenue [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 252 | $ 248 | $ 216
Passenger Revenue [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 9,526 | 8,808 | 5,499
Passenger [Member] | Cargo and Other Revenue [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 128 | 133 | 124
Passenger Tickets [Member] | Passenger Revenue [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 8,016 | 7,430 | 4,533
Passenger Ancillary Services [Member] | Passenger Revenue [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 476 | 447 | 327
Mileage Plan Services [Member] | Passenger Revenue [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,034 | 931 | 639
Mileage Plan Services, Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 648 | 590 | 461
Other Services [Member] | Cargo and Other Revenue [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 124 | $ 115 | $ 92

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