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Leases (Tables) | 12 Months Ended
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Dec. 31, 2023
Leases [Abstract] |
Schedule of Lease Cost | The components of lease costs recognized on the statements of income were as follows:
|  | Year Ended December 31,
(in thousands) | Classification on the Statements of Income | 2023 |  | 2022 |  | 2021
Finance lease costs: |  |  |  |  |  |
Amortization of assets | Depreciation and amortization | $ | 27,170 |  |  | $ | 17,579 |  |  | $ | 13,274 |
Interest on lease liabilities | Interest expense | 27,502 |  |  | 23,034 |  |  | 11,168 |
Operating lease cost | Aircraft lease rentals; Station operations; Maintenance and repairs; Other operating expense | 25,246 |  |  | 24,986 |  |  | 22,697 |
Variable lease cost | Station operations; Maintenance and repairs; Other operating expense | 1,563 |  |  | 1,469 |  |  | 2,565 |
Total lease cost |  | $ | 81,481 |  |  | $ | 67,068 |  |  | $ | 49,704 |
Schedule of Lease-related Asset and Liabilities | The table below presents the lease-related assets and liabilities recorded on the balance sheet.
|  | As of December 31,
(in thousands) | Classification on the Balance Sheet | 2023 |  | 2022
Assets |  |  |  |
Operating lease assets | Operating lease right-of-use assets, net | $ | 100,707 |  |  | $ | 111,679 |
Finance lease assets | Property and equipment, net of accumulated depreciation | 483,083 |  |  | 537,766 |
Total lease assets |  | $ | 583,790 |  |  | $ | 649,445 |
Liabilities |  |  |  |
Current |  |  |  |
Operating | Current operating lease liabilities | $ | 20,873 |  |  | $ | 19,973 |
Finance | Current maturities of long-term debt and finance lease obligations | 25,352 |  |  | 39,080 |
Noncurrent |  |  |  |
Operating | Noncurrent operating lease liabilities | 82,410 |  |  | 94,972 |
Finance | Long-term debt and finance lease obligations | 429,896 |  |  | 455,248 |
Total lease liabilities |  | $ | 558,531 |  |  | $ | 609,273 |
Weighted-average remaining lease term |  |  |  |
Operating leases |  | 7.4 years |  | 7.0 years
Finance leases |  | 7.1 years |  | 7.8 years
Weighted-average discount rate |  |  |  |
Operating leases |  | 5.5 | % |  | 5.4 | %
Finance leases |  | 5.9 | % |  | 5.9 | %
Schedule of Cash Flow, Supplemental Disclosures | The table below presents supplemental cash flow information related to leases during the years ended December 31, 2023 and 2022.
| Year Ended December 31,
(in thousands) | 2023 |  | 2022 |  | 2021
Cash paid for amounts included in the measurement of lease liabilities |  |  |  |  |
Operating cash flows for operating leases | $ | 25,774 |  |  | $ | 25,775 |  |  | $ | 18,987 |
Operating cash flows for finance leases | 27,672 |  |  | 22,366 |  |  | 10,697 |
Financing cash flows for finance leases | 39,044 |  |  | 16,621 |  |  | 14,675 |
Schedule of Future Minimum Payments of Lease Liabilities | The table below indicates the future minimum payments of lease liabilities as of December 31, 2023.
(in thousands) | Operating Leases |  | Finance Leases
2024 | $ | 25,912 |  |  | $ | 51,408 |
2025 | 23,850 |  |  | 51,408 |
2026 | 13,896 |  |  | 51,108 |
2027 | 11,688 |  |  | 51,108 |
2028 | 9,997 |  |  | 65,908 |
Thereafter | 42,616 |  |  | 336,168 |
Total lease payments | 127,959 |  |  | 607,108 |
Less imputed interest | (24,676) |  |  | (151,860) |
Total lease obligations | 103,283 |  |  | 455,248 |
Less current obligations | (20,873) |  |  | (25,352) |
Long-term lease obligations | $ | 82,410 |  |  | $ | 429,896 |

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