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Commitments and Contingencies (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Aircraft
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Aircraft
Jun. 30, 2019
USD ($)
Aug. 01, 2020
USD ($)
Aircraft
Types of Commercial Aircraft [Line Items]          
Rent expense $ 398 $ 414 $ 796 $ 770  
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]          
2019 924   924    
2020 1,892   1,892    
2021 1,806   1,806    
2022 1,696   1,696    
2023 1,727   1,727    
Thereafter 6,113   6,113    
Total $ 14,158   $ 14,158    
Committed to acquire aircraft | Aircraft 27   27    
Commitment to acquire Embraer E-Jet E2 aircraft | Aircraft     25    
Purchase Obligation, Fiscal Year Maturity [Abstract]          
Remainder of 2019 $ 104,611   $ 104,611    
2020 352,453   352,453    
2021 336,473   336,473    
2022 155,037   155,037    
Total 1,022,422   1,022,422    
Purchase Obligation, Due in Fifth Year 73,848   73,848    
Subsequent Event          
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]          
Committed to acquire aircraft | Aircraft         25
Purchase Obligation, Fiscal Year Maturity [Abstract]          
Cost of long-term aircraft purchase commitments with delivery deferral being negotiated         $ 111,302
Unrecorded Unconditional Purchase Obligation         $ 983,922
Pre-Delivery Payments          
Purchase Obligation, Fiscal Year Maturity [Abstract]          
Total $ 109,855   $ 109,855