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Long-Term Debt (Details)
$ in Millions
1 Months Ended 3 Months Ended
Sep. 30, 2020
USD ($)
Mar. 31, 2021
USD ($)
Aircraft
Apr. 23, 2021
USD ($)
Dec. 31, 2018
USD ($)
Senior Secured Revolving Credit Facility        
Debt Instrument, Term   24 months    
Line of Credit Facility, Maximum Borrowing Capacity       $ 81.0
Number Of Aircrafts Included As Collateral | Aircraft   0    
Line of Credit Facility, Periodic Payment, Principal $ 7.4      
Line of Credit Facility [Line Items]        
Repayments of Lines of Credit   $ 46.5    
Airbus A320 Aircraft Series | Senior Secured Revolving Credit Facility        
Debt Instrument, Face Amount   $ 50.0    
Subsequent Event        
Debt Instrument, Face Amount     $ 1.7