v3.26.1
Long-term Debt (Details)
$ in Thousands
 1 Months Ended 3 Months Ended
Apr. 30, 2026
Mar. 31, 2026
USD ($)
aircraft
Dec. 31, 2025
USD ($)
Mar. 31, 2025
USD ($)
Debt Instrument [Line Items]        
Current portion of long-term debt   $ 601,592 $ 550,028  
Current portion of unamortized debt issue cost, net   (3,154) (3,216)  
Current portion of long-term debt, net of debt issue costs   598,438 546,812  
Long-term debt, net of current maturities   1,807,875 1,858,341  
Long-term portion of unamortized debt issue cost, net   (12,183) (13,069)  
Long-term debt, net of current maturities and debt issue costs   1,795,692 1,845,272  
Total long-term debt (including current portion)   2,409,467 2,408,369  
Total unamortized debt issue cost, net   (15,337) (16,285)  
Total long-term debt, net of debt issue costs   2,394,130 $ 2,392,084  
Letters of credit and surety bonds outstanding with various banks and surety institutions   47,500   $ 47,200
Amount outstanding   $ 24,600    
Effective interest rate (as a percent)   4.40%    
Basis spread on variable rate   3.50%    
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]   skyw:SecuredOvernightFinancingRateSofrOneMonthTermMember    
Promissory note        
Debt Instrument [Line Items]        
Debt instrument, term   4 years    
Principal amount   $ 94,000    
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   $ 55,500    
Interest rate (as a percent)   1.00%    
Unsecured debt payable to U.S. Treasury at variable interest rate        
Debt Instrument [Line Items]        
Total long-term debt, net of debt issue costs   $ 145,100    
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 | Subsequent event        
Debt Instrument [Line Items]        
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   $ 75,400    
Basis spread on variable rate   3.50%    
E175        
Debt Instrument [Line Items]        
Number of aircraft delivered | aircraft   1    
Purchase of aircraft financed through long-term debt   $ 23,600    
Debt instrument, term   12 years