XML 20 R46.htm IDEA: XBRL DOCUMENT v2.4.0.6
Commitments and Contingencies (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Y
aircraft
Dec. 31, 2010
Dec. 31, 2009
Commitments and Contingencies      
Number of aircraft leased by the entity 556    
Future minimum rental payments required under operating leases      
2012 $ 392,165,000    
2013 369,002,000    
2014 348,323,000    
2015 305,828,000    
2016 239,698,000    
Thereafter 907,252,000    
Total 2,562,268,000    
Rental expense for non-cancelable aircraft operating leases 346,526,000 311,909,000 300,773,000
Minimum rental expense for airport station rents $ 42,600,000 $ 43,500,000 $ 47,700,000
Leveraged lease agreements term, maximum (in years) 17