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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]  
Future aircraft purchase commitments
(in millions)
Total
Three months ending December 31, 2015
$
380

2016
1,950

2017
2,370

2018
2,270

2019
1,090

Thereafter
4,910

Total
$
12,970