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Long-term Debt (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Long-term Debt    
Long-term debt $ 1,642,022,000 $ 1,815,391,000
Less current maturities (171,454,000) (208,398,000)
Long-term debt, net of current maturities 1,470,568,000 1,606,993,000
Letters of credit and surety bonds outstanding with various banks and surety institutions 75,100,000  
Aggregate amounts of principal maturities of long-term debt    
2013 171,454,000  
2014 177,390,000  
2015 184,510,000  
2016 188,240,000  
2017 161,735,000  
Thereafter 758,693,000  
Total 1,642,022,000 1,815,391,000
CRJ
    
Long-term Debt    
Long-term debt 1,600,000,000  
Effective interest rate (as a percent) 4.50%  
Aggregate amounts of principal maturities of long-term debt    
Total 1,600,000,000  
Notes payable to banks, due in semi-annual installments through 2013 to 2020
    
Long-term Debt    
Interest rate, minimum (as a percent) 1.34%  
Interest rate, maximum (as a percent) 2.55%  
Long-term debt 273,515,000 364,741,000
Variable interest rate, basis LIBOR  
Aggregate amounts of principal maturities of long-term debt    
Total 273,515,000 364,741,000
Notes payable to a financing company, due in semi-annual installments through 2013 to 2021
    
Long-term Debt    
Interest rate, minimum (as a percent) 0.70%  
Interest rate, maximum (as a percent) 2.36%  
Long-term debt 434,716,000 477,241,000
Variable interest rate, basis LIBOR  
Aggregate amounts of principal maturities of long-term debt    
Total 434,716,000 477,241,000
Notes payable to banks, due in semi-annual installments through 2021
    
Long-term Debt    
Interest rate, minimum (as a percent) 6.06%  
Interest rate, maximum (as a percent) 7.18%  
Long-term debt 168,937,000 193,197,000
Aggregate amounts of principal maturities of long-term debt    
Total 168,937,000 193,197,000
Notes payable to a financing company, due in semi-annual installments through 2019
    
Long-term Debt    
Interest rate, minimum (as a percent) 5.78%  
Interest rate, maximum (as a percent) 6.23%  
Long-term debt 39,548,000 53,803,000
Aggregate amounts of principal maturities of long-term debt    
Total 39,548,000 53,803,000
Notes payable to banks, due in monthly installments through 2025
    
Long-term Debt    
Interest rate, minimum (as a percent) 3.15%  
Interest rate, maximum (as a percent) 8.18%  
Long-term debt 665,867,000 706,463,000
Aggregate amounts of principal maturities of long-term debt    
Total 665,867,000 706,463,000
Notes payable to banks, due in semi-annual installments through 2020
    
Long-term Debt    
Interest rate (as a percent) 6.05%  
Long-term debt 17,872,000 19,946,000
Aggregate amounts of principal maturities of long-term debt    
Total 17,872,000 19,946,000
Notes payable to a bank, due in monthly installments through 2016
    
Long-term Debt    
Interest rate, minimum (as a percent) 2.00%  
Interest rate, maximum (as a percent) 4.00%  
Long-term debt 41,567,000  
Variable interest rate, basis LIBOR  
Aggregate amounts of principal maturities of long-term debt    
Total 41,567,000  
Line of credit | SkyWest Airlines
    
Long-term Debt    
Interest rate (as a percent) 4.00%  
Maximum borrowing capacity $ 25,000,000 $ 25,000,000