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SUPPLEMENTAL FINANCIAL INFORMATION - Accounts Payable (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Accounts payable trade | $ 339 | $ 265
Salaries, withholdings and payroll taxes | 536 | 400
Ticket taxes and fees | 318 | 302
Aircraft maintenance payable | 33 | 140
Fuel payable | 86 | 161
Dividends payable | 107 | 107
Third party services | 176 | 269
Other payable | 223 | 218
Accounts payable | $ 1,818 | $ 1,862

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