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Commitments and Contingencies - Aircraft Purchase Commitments By Period (Details) - Future aircraft purchase commitments
$ in Millions
Jun. 30, 2019
USD ($)
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity  
Six months ending December 31, 2019 $ 1,030
2020 3,250
2021 3,250
2022 2,800
2023 1,860
Thereafter 1,930
Total $ 14,120