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Long-term Debt (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
USD ($)
aircraft
Dec. 31, 2024
USD ($)
Debt Instrument [Line Items]    
Current portion of long-term debt $ 522,797 $ 539,061
Current portion of unamortized debt issue cost, net (3,286) (3,472)
Current portion of long-term debt, net of debt issue costs 519,511 535,589
Long-term debt, net of current maturities 1,878,956 2,153,558
Long-term portion of unamortized debt issue cost, net (13,673) (16,772)
Long-term debt, net of current maturities and debt issue costs 1,865,283 2,136,786
Total long-term debt (including current portion) 2,401,753 2,692,619
Total unamortized debt issue cost, net (16,959) (20,244)
Total long-term debt, net of debt issue costs $ 2,384,794 2,672,375
Effective interest rate (as a percent) 4.30%  
Basis spread on variable rate 3.50%  
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:SecuredOvernightFinancingRateSofrMember  
Letters of credit and surety bonds    
Debt Instrument [Line Items]    
Letters of credit and surety bonds outstanding with various banks and surety institutions $ 47,300 $ 47,100
Letters of credit    
Debt Instrument [Line Items]    
Amount outstanding 24,500  
Unsecured debt payable to U.S. Treasury    
Debt Instrument [Line Items]    
Total long-term debt, net of debt issue costs 200,600  
Unsecured debt payable to U.S. Treasury at fixed annual interest rate    
Debt Instrument [Line Items]    
Total long-term debt, net of debt issue costs $ 95,400  
Interest rate (as a percent) 1.00%  
Basis spread on variable rate 2.00%  
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:SecuredOvernightFinancingRateSofrMember  
Unsecured debt payable to U.S. Treasury at variable interest rate    
Debt Instrument [Line Items]    
Total long-term debt, net of debt issue costs $ 105,200  
Basis spread on variable rate 2.00%  
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:SecuredOvernightFinancingRateSofrMember  
Primarily related to acquisition of aircraft and certain spare engines    
Debt Instrument [Line Items]    
Total long-term debt (including current portion) $ 2,400,000  
Total long-term debt, net of debt issue costs 2,200,000  
Line of credit    
Debt Instrument [Line Items]    
Maximum borrowing capacity 100,000  
Amount outstanding 0  
Current borrowing capacity $ 75,500  
Basis spread on variable rate 3.50%  
E175    
Debt Instrument [Line Items]    
Number of aircraft delivered | aircraft 2  
Purchase of aircraft financed through long-term debt $ 47,100  
Debt instrument, term 12 years