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COMMITMENTS (Tables) | 3 Months Ended
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Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Future Minimum Rental Payments for Operating Leases and Unrecorded Unconditional Purchase Obligtaions | Future minimum payments for commitments, excluding operating leases, as of March 31, 2019 (in millions):
| Aircraft Commitments(a) |  | Capacity Purchase Agreements (b) |  | Aircraft Maintenance Deposits
Remainder of 2019 | $ | 417 |  |  | $ | 104 |  |  | $ | 47 |
2020 | 519 |  |  | 145 |  |  | 65 |
2021 | 553 |  |  | 166 |  |  | 59 |
2022 | 305 |  |  | 174 |  |  | 48 |
2023 | 107 |  |  | 179 |  |  | 24 |
Thereafter | 33 |  |  | 1,065 |  |  | 8 |
Total | $ | 1,934 |  |  | $ | 1,833 |  |  | $ | 251 |
(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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