Long-term Debt (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2026 USD ($) aircraft	Dec. 31, 2025 USD ($)
Debt Instrument [Line Items]
Current portion of long-term debt	$ 656,712	$ 550,028
Current portion of unamortized debt issue cost, net	(3,017)	(3,216)
Current portion of long-term debt, net of debt issue costs	653,695	546,812
Long-term debt, net of current maturities	1,654,245	1,858,341
Long-term portion of unamortized debt issue cost, net	(11,482)	(13,069)
Long-term debt, net of current maturities and debt issue costs	1,642,763	1,845,272
Total long-term debt (including current portion)	2,310,957	2,408,369
Total unamortized debt issue cost, net	(14,499)	(16,285)
Total long-term debt, net of debt issue costs	2,296,458	2,392,084
Letters of credit and surety bonds outstanding with various banks and surety institutions	44,000	$ 47,200
Amount outstanding	$ 21,000
Effective interest rate (as a percent)	4.40%
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 variable interest rate
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)	$ 2,300,000
Total long-term debt, net of debt issue costs	2,100,000
Line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity	100,000
Amount outstanding	0
Current borrowing capacity	$ 79,000
Basis spread on variable rate	3.50%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]	skyw:SecuredOvernightFinancingRateSofrOneMonthTermMember
E175
Debt Instrument [Line Items]
Number of aircraft delivered | aircraft	2
Purchase of aircraft financed through long-term debt	$ 47,700
Debt instrument, term	12 years