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COMMITMENTS (Tables) | 9 Months Ended
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Sep. 30, 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 as of September 30, 2017 (in millions):
| Aircraft Leases |  | Facility Leases |  | Aircraft Purchase Commitments |  | Capacity Purchase Agreements (a) |  | Aircraft Maintenance Deposits |  | Aircraft Maintenance and Parts Management
Remainder of 2017 | $ | 77 |  |  | $ | 34 |  |  | $ | 168 |  |  | $ | 21 |  |  | $ | 15 |  |  | $ | 8 |
2018 | 342 |  |  | 73 |  |  | 956 |  |  | 118 |  |  | 61 |  |  | 32 |
2019 | 344 |  |  | 65 |  |  | 806 |  |  | 151 |  |  | 65 |  |  | 35 |
2020 | 317 |  |  | 63 |  |  | 352 |  |  | 158 |  |  | 68 |  |  | 37 |
2021 | 280 |  |  | 55 |  |  | 273 |  |  | 165 |  |  | 63 |  |  | 40 |
Thereafter | 1,263 |  |  | 204 |  |  | 355 |  |  | 1,250 |  |  | 90 |  |  | — |
Total | $ | 2,623 |  |  | $ | 494 |  |  | $ | 2,910 |  |  | $ | 1,863 |  |  | $ | 362 |  |  | $ | 152 |
(a) | Includes all non-aircraft lease costs associated with capacity purchase agreements.

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