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Long-term Debt (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2022
USD ($)
aircraft
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]      
Total $ 3,409,311   $ 3,140,938
Current portion of long-term debt (442,360)   (395,371)
Long-term portion of unamortized debt issue cost, net (25,179)   (28,147)
Long-term debt, net of current maturities and debt issue costs 2,941,772   2,717,420
Current portion of long-term debt 442,360   395,371
Current portion of unamortized debt issue cost, net (3,858)   (3,573)
Current portion of long-term debt, net of debt issue costs $ 438,502   $ 391,798
Basis spread on variable rate 3.50%    
Effective interest rate (as a percent) 4.00%   3.80%
Warrants to purchase shares | shares 785,226    
Loan $ 260,640    
Aggregate amounts of principal maturities of long-term debt      
2023 442,360    
2024 443,642    
2025 527,564    
2026 504,269    
2027 457,326    
Thereafter 1,034,150    
Letters of credit 29,900   $ 31,400
Current borrowing capacity 70,100   43,600
Letters of credit and surety bonds outstanding with various banks and surety institutions $ 59,200   61,400
E175      
Debt Instrument [Line Items]      
Number of aircraft delivered | aircraft 25    
Purchase of aircraft financed through long-term debt $ 516,600    
Minimum      
Debt Instrument [Line Items]      
Interest rate (as a percent) 3.60%    
Minimum | E175      
Debt Instrument [Line Items]      
Debt instrument, term 5 years    
Maximum      
Debt Instrument [Line Items]      
Interest rate (as a percent) 4.70%    
Maximum | E175      
Debt Instrument [Line Items]      
Debt instrument, term 12 years    
Promissory note      
Debt Instrument [Line Items]      
Principal amount $ 167,900    
Promissory note | Minimum      
Debt Instrument [Line Items]      
Debt instrument, term 3 years    
Promissory note | Maximum      
Debt Instrument [Line Items]      
Debt instrument, term 4 years    
Secured loan      
Debt Instrument [Line Items]      
Total   $ 60,000  
Warrants to purchase shares | shares   211,416  
Warrants exercise price | $ / shares   $ 28.38  
Warrant term   5 years  
Treasury Loan Agreement      
Debt Instrument [Line Items]      
Loan   $ 60,000  
Notes payable to banks, due in quarterly installments, plus interest at 2.33% to 5.95% through 2034, secured by aircraft      
Debt Instrument [Line Items]      
Total $ 2,604,058   2,535,827
Notes payable to banks, due in quarterly installments, plus interest at 2.33% to 5.95% through 2034, 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 5.95% through 2034, secured by aircraft | Maximum      
Debt Instrument [Line Items]      
Interest rate (as a percent) 5.95%    
Notes payable to banks, due in monthly or semi-annual installments, plus interest at 2.68% to 5.66% through 2032, secured by aircraft and engines      
Debt Instrument [Line Items]      
Total $ 604,613   404,471
Notes payable to banks, due in monthly or semi-annual installments, plus interest at 2.68% to 5.66% through 2032, secured by aircraft and engines | 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 5.66% through 2032, secured by aircraft and engines | Maximum      
Debt Instrument [Line Items]      
Interest rate (as a percent) 5.66%    
Notes payable to U.S. Government, interest due quarterly at 1.00% through 2025 and based on SOFR plus spread from 2025 through 2031, unsecured      
Debt Instrument [Line Items]      
Interest rate (as a percent) 1.00%    
Total $ 200,640   200,640
Primarily related to acquisition of aircraft and certain spare engines      
Debt Instrument [Line Items]      
Total 3,050,000   2,940,000
Line of credit      
Aggregate amounts of principal maturities of long-term debt      
Maximum borrowing capacity 100,000   75,000
Amount outstanding $ 0   $ 0