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Long-term Debt (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) aircraft | Dec. 31, 2020 USD ($) | Dec. 31, 2022 USD ($)
Debt Instrument [Line Items] |  |  |
Total | $ 3,030,310 |  | $ 3,409,311
Current portion of long-term debt | (447,534) |  | (442,360)
Long-term portion of unamortized debt issue cost, net | (20,593) |  | (25,179)
Long-term debt, net of current maturities and debt issue costs | 2,562,183 |  | 2,941,772
Current portion of long-term debt | 447,534 |  | 442,360
Current portion of unamortized debt issue cost, net | (3,665) |  | (3,858)
Current portion of long-term debt, net of debt issue costs | $ 443,869 |  | $ 438,502
Basis spread on variable rate | 3.50% |  |
Effective interest rate (as a percent) | 4.10% |  | 4.00%
Aggregate amounts of principal maturities of long-term debt |  |  |
2024 | $ 447,534 |  |
2025 | 532,314 |  |
2026 | 510,625 |  |
2027 | 464,280 |  |
2028 | 292,812 |  |
Thereafter | 782,745 |  |
Letters of credit | 29,200 |  | $ 29,900
Current borrowing capacity | 70,800 |  | 70,100
Letters of credit and surety bonds outstanding with various banks and surety institutions | $ 49,100 |  | 59,200
E175 |  |  |
Debt Instrument [Line Items] |  |  |
Number of aircraft delivered | aircraft | 2 |  |
Purchase of aircraft financed through long-term debt | $ 44,700 |  |
Debt instrument, term | 12 years |  |
Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 5.60% |  |
Promissory note |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, term | 8 years |  |
Principal amount | $ 25,000 |  |
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 2035, secured by aircraft |  |  |
Debt Instrument [Line Items] |  |  |
Total | $ 2,302,578 |  | 2,604,058
Notes payable to banks, due in quarterly installments, plus interest at 2.33% to 5.95% through 2035, 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 2035, 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 2.90% to 5.94% through 2032, secured by aircraft and engines |  |  |
Debt Instrument [Line Items] |  |  |
Total | $ 527,092 |  | 604,613
Notes payable to banks, due in monthly or semi-annual installments, plus interest at 2.90% to 5.94% 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 2.90% to 5.94% through 2032, secured by aircraft and engines | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 5.94% |  |
Notes payable to U.S. Government, interest due quarterly at 1.00% through 2025 and based on SOFR plus 2.0% from 2025 through 2031, unsecured |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 1.00% |  |
Total | $ 200,640 |  | 200,640
Basis spread on variable rate | 2.00% |  |
Primarily related to acquisition of aircraft and certain spare engines |  |  |
Debt Instrument [Line Items] |  |  |
Total | $ 3,000,000 |  | 3,400,000
Line of credit |  |  |
Aggregate amounts of principal maturities of long-term debt |  |  |
Maximum borrowing capacity | 100,000 |  | 100,000
Amount outstanding | $ 0 |  | $ 0

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