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Commitments and Contingencies - Schedule of Purchase Obligations (Details) - Future aircraft purchase commitments
$ in Millions
Sep. 30, 2016
USD ($)
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity  
Three months ending December 31, 2016 $ 450
2017 2,690
2018 2,880
2019 3,380
2020 2,540
Thereafter 3,480
Total $ 15,420