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Long-term Debt (Tables) | 12 Months Ended
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Dec. 31, 2020
Long-term Debt |
Schedule of long-term debt | Long-term debt consisted of the following as of December 31, 2020 and 2019 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31, |
​ | ​ | 2020 | ​ | 2019 |
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 | ​ | $ | 18,412 | ​
Notes payable to banks, due in semi-annual installments plus interest at 6.24% to 6.51% through 2021, secured by aircraft | ​ |  | 7,608 | ​ |  | 22,557 | ​
Notes payable to banks, due in monthly or semi-annual installments, plus interest at 2.68% to 6.86% through 2029, secured by aircraft | ​ |  | 424,407 | ​ |  | 438,878 | ​
Notes payable to banks, due in quarterly installments, plus interest at 2.33% to 5.08% through 2032, secured by aircraft | ​ | ​ | 2,618,777 | ​ | ​ | 2,537,676 | ​
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 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 US Government, interest due quarterly at 1.00% through 2025 and based on SOFR plus spread from 2025 through 2030, unsecured | ​ |  | 105,210 | ​ |  | — | ​
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 | ​
Schedule of maturities of long-term debt | The aggregate amounts of principal maturities of long-term debt as of December 31, 2020 were as follows (in thousands):
​ | ​ | ​ | ​ | ​
2021 |  | $ | 406,005 |
2022 | ​ |  | 407,554 | ​
2023 | ​ |  | 418,048 | ​
2024 | ​ |  | 372,322 | ​
2025 | ​ |  | 447,251 | ​
Thereafter | ​ |  | 1,184,822 | ​
​ | ​ | $ | 3,236,002 | ​

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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