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COMMITMENTS (Tables) | 3 Months Ended
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Mar. 31, 2018
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 March 31, 2018 (in millions):
| Aircraft Leases |  | Facility Leases |  | Aircraft Commitments(a) |  | Capacity Purchase Agreements (b) |  | Aircraft Maintenance Deposits
Remainder of 2018 | $ | 265 |  |  | $ | 58 |  |  | $ | 610 |  |  | $ | 100 |  |  | $ | 60 |
2019 | 356 |  |  | 68 |  |  | 560 |  |  | 151 |  |  | 65 |
2020 | 330 |  |  | 61 |  |  | 514 |  |  | 159 |  |  | 68 |
2021 | 287 |  |  | 52 |  |  | 562 |  |  | 166 |  |  | 64 |
2022 | 264 |  |  | 33 |  |  | 303 |  |  | 174 |  |  | 52 |
Thereafter | 1,037 |  |  | 141 |  |  | 141 |  |  | 1,205 |  |  | 38 |
Total | $ | 2,539 |  |  | $ | 413 |  |  | $ | 2,690 |  |  | $ | 1,955 |  |  | $ | 347 |
(a) | Includes non-cancelable contractual commitments for aircraft and engines, buyer furnished equipment, and aircraft maintenance and parts management.
(b) | Includes all non-aircraft lease costs associated with capacity purchase agreements.

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