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Commitments and Contingencies (Details)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
employee
aircraft
Dec. 31, 2021
USD ($)
Dec. 31, 2020
Concentration Risk and Significant Customers      
Accrued workers' compensation liability | $ $ 21.6 $ 17.5  
Accrued workers' compensation liability, current | $ $ 8.0 $ 7.1  
E175      
Concentration Risk and Significant Customers      
Commitment to purchase number of aircraft | aircraft 2    
Revenue from rights, concentration risk | Customer Concentration Risk | Delta, United, and Continental Combined      
Concentration Risk and Significant Customers      
Concentration risk (as a percent) 72.50% 73.50% 76.40%
Full-time equivalent number of employees | Labor Force Concentration Risk      
Concentration Risk and Significant Customers      
Number of employees | employee 13,582    
SkyWest Airlines | Full-time equivalent number of employees | Unionized employees      
Concentration Risk and Significant Customers      
Approximate number of active employees | employee 0