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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Income Taxes |
Schedule of components of provision (benefit) for income taxes | The provision for income taxes includes the following components (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31, |
​ | ​ | 2023 | ​ | 2022 | ​ | 2021 |
Current tax provision (benefit): |  | ​ |  |  | ​ |  |  | ​ |  | ​
Federal | ​ | $ | 4,962 | ​ | $ | (7,319) | ​ | $ | — | ​
State | ​ |  | 1,794 | ​ |  | 1,813 | ​ |  | 846 | ​
​ | ​ |  | 6,756 | ​ |  | (5,506) | ​ |  | 846 | ​
Deferred tax provision (benefit): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ |  | (678) | ​ |  | 21,587 | ​ |  | 32,510 | ​
State | ​ |  | (111) | ​ |  | 3,549 | ​ |  | 5,344 | ​
​ | ​ |  | (789) | ​ |  | 25,136 | ​ |  | 37,854 | ​
Provision for income taxes | ​ | $ | 5,967 | ​ | $ | 19,630 | ​ | $ | 38,700 | ​
Schedule of income tax rate reconciliation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31, |
​ | ​ | 2023 | ​ | 2022 | ​ | 2021 |
Current tax provision (benefit): |  | ​ |  |  | ​ |  |  | ​ |  | ​
Federal | ​ | $ | 4,962 | ​ | $ | (7,319) | ​ | $ | — | ​
State | ​ |  | 1,794 | ​ |  | 1,813 | ​ |  | 846 | ​
​ | ​ |  | 6,756 | ​ |  | (5,506) | ​ |  | 846 | ​
Deferred tax provision (benefit): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ |  | (678) | ​ |  | 21,587 | ​ |  | 32,510 | ​
State | ​ |  | (111) | ​ |  | 3,549 | ​ |  | 5,344 | ​
​ | ​ |  | (789) | ​ |  | 25,136 | ​ |  | 37,854 | ​
Provision for income taxes | ​ | $ | 5,967 | ​ | $ | 19,630 | ​ | $ | 38,700 | ​
Schedule of components of the net deferred tax assets and liabilities | The significant components of the Company’s net deferred tax assets and liabilities as of December 31, 2023 and 2022, are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, |
​ | ​ | 2023 | ​ | 2022 |
Deferred tax assets: |  | ​ |  |  | ​ |  | ​
Accrued benefits | ​ | $ | 28,889 | ​ | $ | 29,154 | ​
Net operating loss carryforward | ​ |  | 130,478 | ​ |  | 186,517 | ​
Aircraft credits | ​ |  | 93,189 | ​ |  | 77,962 | ​
Deferred revenue | ​ | ​ | 91,809 | ​ | ​ | 35,385 | ​
Operating lease liabilities | ​ | ​ | 21,207 | ​ | ​ | 39,209 | ​
Interest deduction limitation | ​ | ​ | 11,563 | ​ | ​ | 26,469 | ​
Accrued reserves and other | ​ |  | 64,971 | ​ |  | 49,972 | ​
Total deferred tax assets | ​ |  | 442,106 | ​ |  | 444,668 | ​
Valuation allowance | ​ |  | (630) | ​ |  | (1,716) | ​
Deferred tax liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accelerated depreciation | ​ |  | (1,108,042) | ​ |  | (1,094,538) | ​
Operating lease right-of-use assets | ​ | ​ | (21,034) | ​ | ​ | (35,474) | ​
Total deferred tax liabilities | ​ |  | (1,129,076) | ​ |  | (1,130,012) | ​
Net deferred tax liability | ​ | $ | (687,600) | ​ | $ | (687,060) | ​
Schedule of unrecognized tax benefits | A reconciliation of the beginning and ending amount of unrecognized tax benefits for the year ended December 31, 2023, 2022, and 2021 is as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
​ | ​ | 2023 | ​ | 2022 | ​ | 2021
Unrecognized tax benefits at the beginning of year |  | $ | 8,210 |  | $ | 15,529 |  | $ | 14,980
Gross increases - current year tax positions | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Gross increases - prior year tax positions | ​ |  | 191 | ​ |  | 343 | ​ |  | 549
Gross decreases - prior year tax positions | ​ | ​ | (7,747) | ​ | ​ | (7,662) | ​ | ​ | —
Unrecognized tax benefits at end of year | ​ | $ | 654 | ​ | $ | 8,210 | ​ | $ | 15,529
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest and penalties in year-end balance | ​ | $ | — | ​ | $ | 607 | ​ | $ | 976

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 9 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-9 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 12 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 19 -SubTopic 10 -Topic 740 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-19 + Details
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