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DEBT (Tables) | 12 Months Ended
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Dec. 31, 2024
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments | Debt obligations on the consolidated balance sheet:
(in millions) | 2024 |  | 2023
Fixed-rate notes payable due through 2029 | $ | 56 |  |  | $ | 80 |
Fixed-rate PSP notes payable due through 2031 | 688 |  |  | 600 |
Fixed-rate EETCs payable due through 2027 | 864 |  |  | 835 |
Fixed-rate Japanese Yen denominated notes payable due through 2031 | 88 |  |  | — |
Variable-rate notes payable due through 2036 | 1,283 |  |  | 971 |
Loyalty financing, variable-rate term loan facility due through 2031 | 750 |  |  | — |
Loyalty financing, fixed-rate notes due through 2029 and 2031 | 1,250 |  |  | — |
Less debt issuance costs | (46) |  |  | (15) |
Total debt | 4,933 |  |  | 2,471 |
Less current portion | 442 |  |  | 289 |
Long-term debt, less current portion | $ | 4,491 |  |  | $ | 2,182 |
Weighted-average fixed-interest rate | 3.9 | % |  | 3.4 | %
Weighted-average variable-interest rate | 6.3 | % |  | 6.8 | %
Schedule of Maturities of Long-term Debt | At December 31, 2024, long-term debt principal payments for the next five years and thereafter are as follows:
(in millions) | Total(a)
2025 | $ | 460 |
2026 | 502 |
2027 | 699 |
2028 | 209 |
2029 | 775 |
Thereafter | 2,364 |
Total Principal Payments | $ | 5,009 |

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