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Long-term Debt (Tables) | 12 Months Ended
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Dec. 31, 2021
Long-term Debt |
Schedule of long-term debt | Long-term debt consisted of the following as of December 31, 2021 and 2020 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31, |
​ | ​ | 2021 | ​ | 2020 |
Notes payable to banks, due in quarterly installments, plus interest at 2.33% to 5.08% through 2033, secured by aircraft | ​ | $ | 2,535,827 | ​ | $ | 2,618,777 | ​
Notes payable to banks, due in monthly or semi-annual installments, plus interest at 2.68% to 5.03% through 2031, secured by aircraft | ​ |  | 404,471 | ​ |  | 424,407 | ​
Notes payable to US Government, interest due quarterly at 1.00% through 2025 and based on SOFR plus spread from 2025 through 2031, unsecured | ​ |  | 200,640 | ​ |  | 105,210 | ​
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 | ​ | ​ | — | ​ | ​ | 60,000 | ​
Notes payable to bank, due in monthly installments interest based on LIBOR plus interest spread at 2.65% through 2021 | ​ | ​ | — | ​ | ​ | 13,795 | ​
Notes payable to banks, due in semi-annual installments plus interest at 6.24% to 6.51% through 2021, secured by aircraft | ​ | ​ | — | ​ |  | 7,608 | ​
Notes payable to a financing company, due in semi-annual installments, with a fixed interest rate of 3.25% through 2021, secured by aircraft | ​ |  | — | ​ |  | 6,205 | ​
Long-term debt | ​ | $ | 3,140,938 | ​ | $ | 3,236,002 | ​
Current portion of long-term debt | ​ |  | (395,371) | ​ |  | (406,005) | ​
Less long-term portion of unamortized debt issue cost, net | ​ | ​ | (28,147) | ​ | ​ | (28,459) | ​
Long-term debt, net of current maturities and debt issue costs | ​ | $ | 2,717,420 | ​ | $ | 2,801,538 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current portion of long-term debt | ​ |  | 395,371 | ​ |  | 406,005 | ​
Less current portion of unamortized debt issue cost, net | ​ | ​ | (3,573) | ​ | ​ | (3,847) | ​
Current portion of long-term debt, net of debt issue costs | ​ | $ | 391,798 | ​ | $ | 402,158 | ​
Schedule of maturities of long-term debt | The aggregate amounts of principal maturities of long-term debt as of December 31, 2021 were as follows (in thousands):
​ | ​ | ​ | ​ | ​
2022 |  | $ | 395,371 |
2023 | ​ |  | 403,091 | ​
2024 | ​ |  | 398,084 | ​
2025 | ​ |  | 413,846 | ​
2026 | ​ |  | 423,227 | ​
Thereafter | ​ |  | 1,107,319 | ​
​ | ​ | $ | 3,140,938 | ​

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