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COMMITMENTS (Tables) | 3 Months Ended
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Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Future Minimum Rental Payments for Operating Leases and Unrecorded Unconditional Purchase Obligtaions | Future minimum fixed payments for commitments (in millions):
March 31, 2016 | Aircraft Leases |  | Facility Leases |  | Aircraft Purchase Commitments |  | Capacity Purchase Agreements (a)
Remainder of 2016 | $ | 60 |  |  | $ | 70 |  |  | $ | 402 |  |  | $ | 53 |
2017 | 104 |  |  | 90 |  |  | 516 |  |  | 90 |
2018 | 98 |  |  | 43 |  |  | 472 |  |  | 94 |
2019 | 90 |  |  | 42 |  |  | 381 |  |  | 99 |
2020 | 81 |  |  | 40 |  |  | 320 |  |  | 106 |
Thereafter | 467 |  |  | 147 |  |  | 392 |  |  | 858 |
Total | $ | 900 |  |  | $ | 432 |  |  | $ | 2,483 |  |  | $ | 1,300 |

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