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LONG-TERM DEBT - SCHEDULE OF LONG-TERM DEBT (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2024 | Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Debt Instrument [Line Items] |  |  |  |  |
Debt Issuance Costs, Net |  | $ (14) | $ (14) |  | $ (15)
Total |  | 2,672 | 2,672 |  | 2,471
Less current portion |  | (359) | (359) |  | (289)
Long-term debt, less current portion |  | $ 2,313 | $ 2,313 |  | $ 2,182
Weighted-average fixed-interest rate |  | 3.30% | 3.30% |  | 3.40%
Weighted-average variable-interest rate |  | 6.90% | 6.90% |  | 6.80%
Long-term debt payments |  |  | $ 149 | $ 149 |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 39.06 | $ 39.06 |  |
Proceeds from issuance of debt |  |  | $ 279 | $ 0 |
Proceeds from Issuance of Long-term Debt |  |  | $ 348 |  |
Debt, Weighted Average Interest Rate |  | 4.70% | 4.70% |  |
Proceeds from Issuance of Long-term Debt |  |  | $ 348 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 626 | 626 |  |
Scheduled Debt Payments [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt payments |  |  | 149 |  |
Fixed rate notes payable due through 2029 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total |  | 68 | 68 |  | $ 80
US Treasury CARES Act Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Adjustments to Additional Paid in Capital, Warrant Issued |  |  | 30 |  |
July 2020 EETC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total |  | 779 | 779 |  | 835
Credit Facility 1 [Member] | Secured by certain accounts receivable, spare engines, spare parts and ground service equipment [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 150 | 150 |  |
PSP Notes Payable through 2031 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total |  | 600 | 600 |  | 600
Variable rate notes payable due through 2035 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total |  | 1,239 | 1,239 |  | $ 971
Proceeds from Issuance of Long-Term Debt, Cash proceeds [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  | 280 |  |  |
Proceeds from Issuance of Long-term Debt |  | 280 |  |  |
Proceeds from Issuance of Long-Term Debt, Cash proceeds [Member] | Subsequent Event [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from Issuance of Long-term Debt | $ 67 |  |  |  |
Proceeds from Issuance of Long-term Debt | $ 67 |  |  |  |
Proceeds from Issuance of Long-Term Debt, Noncash proceeds [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  | 68 |  |
Proceeds from Issuance of Long-term Debt |  |  | 68 |  |
Variable Rate debt with interest rate swap [Member] | Interest rate swaps agreements [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Derivative, Notional Amount |  | 223 | 223 |  |
Derivative, Notional Amount |  | $ 223 | $ 223 |  |

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