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Commitments and Contingencies (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Y
aircraft
Dec. 31, 2011
Dec. 31, 2010
Commitments and Contingencies      
Number of aircraft leased by the entity 568    
Future minimum rental payments required under operating leases      
2013 $ 387,999,000    
2014 360,797,000    
2015 309,378,000    
2016 239,989,000    
2017 182,291,000    
Thereafter 720,733,000    
Total 2,201,187,000    
Rental expense for non-cancelable aircraft operating leases 333,637,000 346,526,000 311,909,000
Minimum rental expense for airport station rents $ 43,500,000 $ 42,600,000 $ 43,500,000
Leveraged lease agreements term, maximum (in years) 17