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GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - PROPERTY, EQUIPMENT AND DEPRECIATION (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Property, Plant and Equipment [Line Items] |  |  |
Special items - net non-operating | $ (16) | $ 18 | $ 0
Capitalized Computer Software, Net | 155 | 66 |
Capitalized Computer Software, Amortization | 47 | 25 | $ 17
Aircraft Maintenance Deposits, Current | $ 42 | $ 70 |
Buildings |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Salvage Value | 10.00% |  |
Buildings | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 30 years |  |
Buildings | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 40 years |  |
Minor building and land improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 10 years |  |
Estimated Salvage Value | 0.00% |  |
Capitalized leases and leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Salvage Value | 0.00% |  |
Computer hardware and software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Salvage Value | 0.00% |  |
Computer hardware and software | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 3 years |  |
Computer hardware and software | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 5 years |  |
Other furniture and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Salvage Value | 0.00% |  |
Other furniture and equipment | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 3 years |  |
Other furniture and equipment | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 10 years |  |
Boeing 717-200 aircraft | Aircraft |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Salvage Value | 10.00% |  |
Boeing 717-200 aircraft | Aircraft | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 3 years |  |
Boeing 717-200 aircraft | Aircraft | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 4 years |  |
Boeing 737 aircraft | Aircraft |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Salvage Value | 10.00% |  |
Boeing 737 aircraft | Aircraft | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 20 years |  |
Boeing 737 aircraft | Aircraft | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 25 years |  |
Boeing 787-9 aircraft | Aircraft |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 25 years |  |
Estimated Salvage Value | 10.00% |  |
Airbus A321neo aircraft | Aircraft |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Salvage Value | 10.00% |  |
Airbus A321neo aircraft | Aircraft | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 18 years |  |
Airbus A321neo aircraft | Aircraft | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 20 years |  |
Airbus A330 aircraft | Aircraft |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Salvage Value | 10.00% |  |
Airbus A330 aircraft | Aircraft | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 11 years |  |
Airbus A330 aircraft | Aircraft | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 15 years |  |
Embraer E175 aircraft | Aircraft |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Salvage Value | 10.00% |  |
Embraer E175 aircraft | Aircraft | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 20 years |  |

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