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Long-term Debt (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
aircraft
$ / shares
shares
Oct. 28, 2020
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]        
Total long-term debt $ 3,236,002     $ 3,017,523
Current portion of long-term debt (406,005)     (367,954)
Less long-term portion of unamortized debt issue cost, net (28,459)     (20,580)
Long-term debt, net of current maturities and debt issue costs 2,801,538     2,628,989
Current portion of long-term debt 406,005     367,954
Less current portion of unamortized debt issue cost, net (3,847)     (3,828)
Current portion of long-term debt, net of debt issue costs $ 402,158     $ 364,126
Effective interest rate (as a percent) 4.00%     4.20%
Aggregate amounts of principal maturities of long-term debt        
2021 $ 406,005      
2022 407,554      
2023 418,048      
2024 372,322      
2025 447,251      
Thereafter 1,184,822      
Repayment of debt in cash 30,100      
Total repayment of debt 30,100      
Letters of credit 35,500     $ 8,800
Current borrowing capacity 39,500     66,200
Letters of credit and surety bonds outstanding with various banks and surety institutions $ 61,100     61,700
E175        
Debt Instrument [Line Items]        
Number of aircraft delivered | aircraft 6      
Purchase of aircraft financed through long-term debt $ 107,700      
Debt instrument, term 12 years      
CRJ 700        
Debt Instrument [Line Items]        
Number of aircraft delivered | aircraft 21      
Purchase of aircraft financed through long-term debt $ 133,500      
CRJ 700 | Quarterly Installments        
Debt Instrument [Line Items]        
Interest rate (as a percent) 3.50%      
Number of aircraft delivered | aircraft 10      
Debt instrument, term 7 years 6 months      
CRJ 700 | Monthly Installments        
Debt Instrument [Line Items]        
Interest rate (as a percent) 4.00%      
Number of aircraft delivered | aircraft 11      
Debt instrument, term 5 years      
Minimum | E175        
Debt Instrument [Line Items]        
Interest rate (as a percent) 2.30%      
Maximum | E175        
Debt Instrument [Line Items]        
Interest rate (as a percent) 3.45%      
Promissory note        
Debt Instrument [Line Items]        
Common stock value issued $ 5,000      
Warrants to purchase shares | shares 370,720      
Warrants exercise price | $ / shares $ 28.38      
Warrant term 5 years      
Long-term debt $ 105,200      
Principal amount 105,200      
Secured loan        
Debt Instrument [Line Items]        
Total long-term debt 60,000      
Common stock value issued $ 3,200      
Number of subsequent borrowings | aircraft 2      
Warrants to purchase shares | shares 211,416      
Warrants exercise price | $ / shares $ 28.38      
Warrant term 5 years      
Aggregate amounts of principal maturities of long-term debt        
Maximum borrowing capacity   $ 725,000 $ 573,000  
Notes payable to a financing company, due in semi-annual installments, with a fixed interest rate of 3.25% through 2021, secured by aircraft        
Debt Instrument [Line Items]        
Interest rate (as a percent) 3.25%      
Total long-term debt $ 6,205     18,412
Notes payable to banks, due in semi-annual installments plus interest at 6.24% to 6.51% through 2021, secured by aircraft        
Debt Instrument [Line Items]        
Total long-term debt $ 7,608     22,557
Notes payable to banks, due in semi-annual installments plus interest at 6.24% to 6.51% through 2021, secured by aircraft | Minimum        
Debt Instrument [Line Items]        
Interest rate (as a percent) 6.24%      
Notes payable to banks, due in semi-annual installments plus interest at 6.24% to 6.51% through 2021, secured by aircraft | Maximum        
Debt Instrument [Line Items]        
Interest rate (as a percent) 6.51%      
Notes payable to banks, due in monthly or semi-annual installments, plus interest at 2.68% to 6.86% through 2029, secured by aircraft        
Debt Instrument [Line Items]        
Total long-term debt $ 424,407     438,878
Notes payable to banks, due in monthly or semi-annual installments, plus interest at 2.68% to 6.86% through 2029, secured by aircraft | Minimum        
Debt Instrument [Line Items]        
Interest rate (as a percent) 2.68%      
Notes payable to banks, due in monthly or semi-annual installments, plus interest at 2.68% to 6.86% through 2029, secured by aircraft | Maximum        
Debt Instrument [Line Items]        
Interest rate (as a percent) 6.86%      
Notes payable to banks, due in quarterly installments, plus interest at 2.33% to 5.08% through 2032, secured by aircraft        
Debt Instrument [Line Items]        
Total long-term debt $ 2,618,777     2,537,676
Notes payable to banks, due in quarterly installments, plus interest at 2.33% to 5.08% through 2032, secured by aircraft | Minimum        
Debt Instrument [Line Items]        
Interest rate (as a percent) 2.33%      
Notes payable to banks, due in quarterly installments, plus interest at 2.33% to 5.08% through 2032, secured by aircraft | Maximum        
Debt Instrument [Line Items]        
Interest rate (as a percent) 5.08%      
Notes payable to bank, due in monthly installments interest based on LIBOR plus interest spread at 2.65% through 2021        
Debt Instrument [Line Items]        
Total long-term debt $ 13,795      
Notes payable to US Government, interest due quarterly based on LIBOR plus interest spread currently at 3.22% through 2025, secured by parts and engines        
Debt Instrument [Line Items]        
Total long-term debt $ 60,000      
Basis spread on variable rate 3.22%      
Notes payable to US Government, interest due quarterly at 1.00% through 2025 and based on SOFR plus spread from 2025 through 2030, unsecured        
Debt Instrument [Line Items]        
Total long-term debt $ 105,210      
Primarily related to acquisition of aircraft and certain spare engines        
Debt Instrument [Line Items]        
Total long-term debt 3,070,000     3,020,000
Line of credit        
Aggregate amounts of principal maturities of long-term debt        
Maximum borrowing capacity 75,000     75,000
Amount outstanding $ 0     $ 0
LIBOR | Notes payable to bank, due in monthly installments interest based on LIBOR plus interest spread at 2.65% through 2021        
Debt Instrument [Line Items]        
Basis spread on variable rate 2.65%      
LIBOR | Notes payable to US Government, interest due quarterly at 1.00% through 2025 and based on SOFR plus spread from 2025 through 2030, unsecured        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.00%      
LIBOR | Line of credit        
Debt Instrument [Line Items]        
Basis spread on variable rate 2.50%