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Schedule of Acquisition of Aircrafts and Related Spare Engines (Detail)
$ in Billions
Dec. 31, 2017
USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]  
2018 $ 3.2
2019 2.9
2020 2.1
2021 2.4
2022 1.8
After 2022 9.8
Total commitments $ 22.2