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Leases (Tables)
 12 Months Ended
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 Income202320222021
Finance lease costs:
Amortization of assetsDepreciation and amortization$27,170 $17,579 $13,274 
Interest on lease liabilitiesInterest expense27,502 23,034 11,168 
Operating lease costAircraft lease rentals; Station operations; Maintenance and repairs; Other operating expense25,246 24,986 22,697 
Variable lease costStation operations; Maintenance and repairs; Other operating expense1,563 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 Sheet20232022
Assets
Operating lease assetsOperating lease right-of-use assets, net$100,707 $111,679 
Finance lease assetsProperty and equipment, net of accumulated depreciation483,083 537,766 
Total lease assets$583,790 $649,445 
Liabilities
Current
OperatingCurrent operating lease liabilities$20,873 $19,973 
FinanceCurrent maturities of long-term debt and finance lease obligations25,352 39,080 
Noncurrent
OperatingNoncurrent operating lease liabilities82,410 94,972 
FinanceLong-term debt and finance lease obligations429,896 455,248 
Total lease liabilities$558,531 $609,273 
Weighted-average remaining lease term
Operating leases7.4 years7.0 years
Finance leases7.1 years7.8 years
Weighted-average discount rate
Operating leases5.5 %5.4 %
Finance leases5.9 %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)202320222021
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 leases27,672 22,366 10,697 
Financing cash flows for finance leases39,044 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 LeasesFinance Leases
2024$25,912 $51,408 
202523,850 51,408 
202613,896 51,108 
202711,688 51,108 
20289,997 65,908 
Thereafter42,616 336,168 
Total lease payments127,959 607,108 
Less imputed interest(24,676)(151,860)
Total lease obligations103,283 455,248 
Less current obligations(20,873)(25,352)
Long-term lease obligations$82,410 $429,896