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COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
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Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Future Minimum Rental Payments for Operating Leases and Unrecorded Unconditional Purchase Obligtaions [Table Text Block] | Future minimum payments for commitments as of December 31, 2023 (in millions):
|  | Aircraft-Related Commitments(a) |  | Capacity Purchase Agreements and Other Obligations(b)
2024 |  | $ | 1,252 |  |  | $ | 235 |
2025 |  | 1,366 |  |  | 230 |
2026 |  | 1,097 |  |  | 224 |
2027 |  | 600 |  |  | 220 |
2028 |  | 151 |  |  | 223 |
Thereafter |  | 716 |  |  | 515 |
Total |  | $ | 5,182 |  |  | $ | 1,647 |

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