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Schedule of Acquisition of Aircrafts and Related Spare Engines (Detail)
$ in Billions
Jun. 30, 2016
USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]  
Last six months of 2016 $ 2.3
2017 4.3
2018 4.3
2019 3.3
2020 2.6
After 2020 6.9
Total commitments $ 23.7