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COVID-19 COVID-19 (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 20, 2020
USD ($)
$ / shares
shares
Apr. 30, 2020
Aircraft
engine
Mar. 31, 2020
Jun. 30, 2021
USD ($)
Apr. 09, 2020
$ / shares
Apr. 01, 2020
USD ($)
Feb. 13, 2020
USD ($)
Feb. 01, 2019
USD ($)
Unusual or Infrequent Item, or Both [Line Items]                
Debt Instrument, Face Amount             $ 545,500,000 $ 450,000,000.0
Decrease in Revenue Compared to Prior Year     36.00%          
Employee Related Cost Reductions, Percentage, Salary Reduction, Executive Officers     50.00%          
Employee Related Cost Reductions, Number Of Employees Volunteering For Leave     1,100          
Subsequent Event                
Unusual or Infrequent Item, or Both [Line Items]                
Debt Instrument, Face Amount $ 21,600,000         $ 31,000,000.0    
Flight Capacity Reduction           87.40%    
Credit Voucher Term Expiration   2 years            
Number Of Aircrafts Included As Collateral | Aircraft   2            
Total Expected Receipts of Relief Through Payroll Support Program of CARES Act 171,900,000              
Maximum Expected Proceeds From Payroll Support Program, Direct Grant From Treasury 150,300,000              
Maximum Expected Proceeds From Payroll Support Program, Low-Interest Loan $ 21,600,000              
Debt Instrument, Term 10 years              
Total Amount Of Relief Granted Through Payroll Support Program Of CARES Act $ 86,000,000.0              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares 25,898              
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 83.33       $ 83.33      
Expected Tax Refunds From CARES Act       $ 194,000,000.0        
Total Expected Receipts of Relief through Loan Programs of CARES Act $ 276,000,000.0              
Asset, Aircraft, Unencumbered | Aircraft   28            
Asset, Engine, Unencumbered | engine   8