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Schedule of Acquisition of Aircrafts and Related Spare Engines (Detail)
$ in Billions
Jun. 30, 2017
USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]  
Last six months of 2017 $ 2.1
2018 2.9
2019 3.6
2020 2.9
2021 2.3
After 2021 8.2
Total commitments $ 22.0