Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Prepayments On Flight Equipment (Narrative) (Details)

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Prepayments On Flight Equipment (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Mar. 23, 2012
Dec. 31, 2011
Airbus [Member]
A320 Aircraft [Member]
Dec. 31, 2009
Airbus [Member]
A320 Aircraft [Member]
Dec. 31, 2005
Airbus [Member]
A320 Aircraft [Member]
May 31, 2007
Airbus [Member]
A330 Wide-Body Aircraft [Member]
Dec. 31, 2006
Airbus [Member]
A330 Wide-Body Aircraft [Member]
Dec. 31, 2011
Airbus [Member]
A330 Wide-Body Aircraft [Member]
Dec. 31, 2009
Airbus [Member]
A330 Wide-Body Aircraft [Member]
Dec. 31, 2010
Boeing [Member]
Boeing 737-800 [Member]
Dec. 31, 2010
Boeing [Member]
Maximum [Member]
Boeing 737-800 [Member]
Property, Plant and Equipment [Line Items]                          
Number of aircraft ordered             70   20       15
Number of aircraft ordered subject to reconfirmation rights             5            
Number of additional aircraft ordered           4   10   27 2    
Number of aircraft delivered       4 52                
Number of aircraft sold         12         8      
Number of aircraft remaining to be delivered         5         5   10  
Number of purchase rights                       5  
Interest capitalized $ 4,439 $ 7,978 $ 23,001