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Commitments and Contingent Liabilities (Details 2) (USD $)
1 Months Ended
Sep. 30, 2013
Credit card processing agreements
Dec. 31, 2012
Credit card processing agreements
May 31, 2013
Enhanced Equipment Trust Certificates (EETC)
item
May 31, 2013
Enhanced Equipment Trust Certificates (EETC)
Class A pass-through trust
May 31, 2013
Enhanced Equipment Trust Certificates (EETC)
Class B pass-through trust
Commitments          
Number of pass-through trusts     2    
Aggregate principal amount issued     $ 444,500,000 $ 328,200,000 $ 116,300,000
Stated interest rate (as a percent)       3.90% 4.95%
Number of aircraft financed through loan     6    
Restricted cash $ 5,000,000 $ 5,000,000 $ 16,000,000    
Maximum limit of holdback (as a percent) 100.00%