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Commitments and Contingencies - Schedule of Purchase Obligations (Details) - Future aircraft purchase commitments
$ in Millions
Mar. 31, 2016
USD ($)
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity  
Nine months ending December 31, 2016 $ 1,660
2017 2,500
2018 2,510
2019 1,500
2020 1,900
Thereafter 3,010
Total $ 13,080