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COMMITMENTS (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) aircraft carriers | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) aircraft carriers | Sep. 30, 2015 USD ($) | Oct. 11, 2016 aircraft
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |  |  |
Rent Expense | $ 82 | $ 77 | $ 226 | $ 217 |
Capacity purchase arrangements (carriers) | carriers | 3 |  | 3 |  |
Aircraft Commitments [Member] |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |  |  |
Remainder of 2016 | $ 146 |  | $ 146 |  |
2017 | 931 |  | 931 |  |
2018 | 724 |  | 724 |  |
2019 | 645 |  | 645 |  |
2020 | 334 |  | 334 |  |
Thereafter | 397 |  | 397 |  |
Total | 3,177 |  | 3,177 |  |
Capacity Purchase Agreements [Member] |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |  |  |
Remainder of 2016 | 17 |  | 17 |  |
2017 | 78 |  | 78 |  |
2018 | 81 |  | 81 |  |
2019 | 86 |  | 86 |  |
2020 | 92 |  | 92 |  |
Thereafter | 746 |  | 746 |  |
Total | 1,100 |  | 1,100 |  |
Aircraft [Member] |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |
Remainder of 2016 | 20 |  | 20 |  |
2017 | 99 |  | 99 |  |
2018 | 90 |  | 90 |  |
2019 | 82 |  | 82 |  |
2020 | 73 |  | 73 |  |
Thereafter | 400 |  | 400 |  |
Total | 764 |  | 764 |  |
Facility Leases [Member] |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |  |
Remainder of 2016 | 24 |  | 24 |  |
2017 | 91 |  | 91 |  |
2018 | 43 |  | 43 |  |
2019 | 43 |  | 43 |  |
2020 | 40 |  | 40 |  |
Thereafter | 188 |  | 188 |  |
Total | $ 429 |  | $ 429 |  |
B-737 [Member] |  |  |  |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |  |
Number of lease contracts (aircraft) | aircraft | 18 |  | 18 |  |
Q400 [Member] |  |  |  |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |  |
Number of lease contracts (aircraft) | aircraft | 15 |  | 15 |  |
E175 [Member] |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |  |  |
Committed to Purchase (in Aircraft) | aircraft | 33 |  | 33 |  |
Options to Purchase Additional (in Aircraft) | aircraft | 30 |  | 30 |  |
Horizon [Member] |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |  |  |
Capacity purchase arrangements | 100.00% |  | 100.00% |  |
Capacity Purchase Agreement with SkyWest [Member] |  |  |  |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |  |
Number of lease contracts (aircraft) | aircraft | 16 |  | 16 |  |
Capacity Purchase Agreement with SkyWest [Member] | CRJ-700 [Member] |  |  |  |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |  |
Number of lease contracts (aircraft) | aircraft | 3 |  | 3 |  |
Capacity Purchase Agreement with SkyWest [Member] | E175 [Member] |  |  |  |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |  |
Number of lease contracts (aircraft) | aircraft | 13 |  | 13 |  |
Number of optional additional leases (aircraft) | aircraft | 8 |  | 8 |  |
Subsequent Event [Member] | B-737 [Member] |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |  |  |
Committed to Purchase (in Aircraft) | aircraft |  |  |  |  | 56
Options to Purchase Additional (in Aircraft) | aircraft |  |  |  |  | 41
Subsequent Event [Member] | B737 MAX [Member] |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Quantity Deferred | aircraft |  |  |  |  | 4
Committed to Purchase (in Aircraft) | aircraft |  |  |  |  | 37
Subsequent Event [Member] | Boeing, 737-900ER [Member] |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |  |  |
Options to Purchase Additional, Exercised(in Aircraft) | aircraft |  |  |  |  | 5
Committed to Purchase (in Aircraft) | aircraft |  |  |  |  | 19

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