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Long-term Debt (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) aircraft $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares
Debt Instrument [Line Items] |  |
Total long-term debt | $ 3,140,938 | $ 3,236,002
Current portion of long-term debt | (395,371) | (406,005)
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
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
Effective interest rate (as a percent) | 3.80% | 4.00%
Warrants to purchase shares | shares | 785,226 |
Warrants exercise price | $ / shares | $ 57.47 |
Loan | $ 260,640 |
Repayment of debt | 61,200 |
Repayments of secured debt | 80,100 |
Aggregate amounts of principal maturities of long-term debt |  |
2022 | 395,371 |
2023 | 403,091 |
2024 | 398,084 |
2025 | 413,846 |
2026 | 423,227 |
Thereafter | 1,107,319 |
Letters of credit | 31,400 | $ 35,500
Current borrowing capacity | 43,600 | 39,500
Letters of credit and surety bonds outstanding with various banks and surety institutions | $ 61,400 | 61,100
E175 [Member] |  |
Debt Instrument [Line Items] |  |
Number of aircraft delivered | aircraft | 18 |
Purchase of aircraft financed through long-term debt | $ 354,600 |
Minimum [Member] | E175 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 2.70% |
Debt instrument, term | 5 years |
Maximum [Member] | E175 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 3.10% |
Debt instrument, term | 12 years |
Promissory note |  |
Debt Instrument [Line Items] |  |
Common stock value issued | $ 5,800 |
Long-term debt | 95,400 |
Principal amount | $ 95,400 |
Promissory note | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Warrants to purchase shares | shares | 203,090 |
Secured loan |  |
Debt Instrument [Line Items] |  |
Total long-term debt |  | $ 60,000
Warrants to purchase shares | shares |  | 211,416
Warrants exercise price | $ / shares |  | $ 28.38
Warrant term |  | 5 years
Loan |  | $ 60,000
Treasury Loan Agreement |  |
Debt Instrument [Line Items] |  |
Loan |  | 60,000
Warrant Shares | PSP Extension Agreement |  |
Debt Instrument [Line Items] |  |
Warrants to purchase shares | shares | 124,773 |
Warrants exercise price | $ / shares | $ 40.41 |
Warrant term | 5 years |
Warrant Shares | PSP 3 Agreement |  |
Debt Instrument [Line Items] |  |
Warrants to purchase shares | shares | 78,317 |
Warrants exercise price | $ / shares | $ 57.47 |
Warrant term | 5 years |
Notes payable to banks, due in quarterly installments, plus interest at 2.33% to 5.08% through 2033, secured by aircraft |  |
Debt Instrument [Line Items] |  |
Total long-term debt | $ 2,535,827 | 2,618,777
Notes payable to banks, due in quarterly installments, plus interest at 2.33% to 5.08% through 2033, secured by aircraft | Minimum [Member] |  |
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 2033, secured by aircraft | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 5.08% |
Notes payable to banks, due in monthly or semi-annual installments, plus interest at 2.68% to 5.03% through 2031, secured by aircraft |  |
Debt Instrument [Line Items] |  |
Total long-term debt | $ 404,471 | 424,407
Notes payable to banks, due in monthly or semi-annual installments, plus interest at 2.68% to 5.03% through 2031, secured by aircraft | Minimum [Member] |  |
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 5.03% through 2031, secured by aircraft | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 5.03% |
Notes payable to US 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 long-term debt | $ 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 |  |
Debt Instrument [Line Items] |  |
Total long-term debt |  | 60,000
Notes payable to bank, due in monthly installments interest based on LIBOR plus interest spread at 2.65% through 2021 |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 2.65% |
Total long-term debt |  | 13,795
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
Notes payable to banks, due in semi-annual installments plus interest at 6.24% to 6.51% through 2021, secured by aircraft | Minimum [Member] |  |
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 [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate (as a percent) | 6.51% |
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
Primarily related to acquisition of aircraft and certain spare engines |  |
Debt Instrument [Line Items] |  |
Total long-term debt | $ 2,940,000 | 3,070,000
Line of Credit [Member] |  |
Aggregate amounts of principal maturities of long-term debt |  |
Maximum borrowing capacity | 75,000 | 75,000
Amount outstanding | $ 0 | $ 0
LIBOR | 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] |  |
Interest rate (as a percent) | 3.22% |
LIBOR | Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.50% |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: 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 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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