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COMMITMENTS (Tables) | 3 Months Ended
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Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Future Minimum Rental Payments for Operating Leases and Unrecorded Unconditional Purchase Obligtaions | Future minimum payments for commitments (in millions) as of March 31, 2017:
| Aircraft Leases |  | Facility Leases |  | Aircraft Purchase Commitments |  | Capacity Purchase Agreements (a) |  | Aircraft Maintenance Deposits |  | Aircraft Maintenance and Parts Management
Remainder of 2017 | $ | 227 |  |  | $ | 91 |  |  | $ | 758 |  |  | $ | 58 |  |  | $ | 44 |  |  | $ | 23 |
2018 | 318 |  |  | 73 |  |  | 876 |  |  | 80 |  |  | 61 |  |  | 32 |
2019 | 306 |  |  | 64 |  |  | 730 |  |  | 85 |  |  | 65 |  |  | 35 |
2020 | 279 |  |  | 57 |  |  | 337 |  |  | 90 |  |  | 68 |  |  | 37 |
2021 | 242 |  |  | 50 |  |  | 275 |  |  | 94 |  |  | 63 |  |  | 40 |
Thereafter | 953 |  |  | 173 |  |  | 361 |  |  | 676 |  |  | 90 |  |  | — |
Total | $ | 2,325 |  |  | $ | 508 |  |  | $ | 3,337 |  |  | $ | 1,083 |  |  | $ | 391 |  |  | $ | 167 |

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