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Leases (Tables)
 12 Months Ended
Dec. 31, 2022
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 Income20222021
Finance lease costs:
Amortization of assetsDepreciation and amortization$17,579 $13,274 
Interest on lease liabilitiesInterest expense23,034 11,168 
Operating lease costAircraft lease rentals; Station operations; Maintenance and repairs; Other operating expense24,986 22,697 
Variable lease costStation operations; Maintenance and repairs; Other operating expense1,469 2,565 
Total lease cost$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 Sheet20222021
Assets
Operating lease assetsOperating lease right-of-use assets, net$111,679 $130,087 
Finance lease assetsProperty and equipment, net537,766 338,469 
Total lease assets$649,445 $468,556 
Liabilities
Current
OperatingCurrent operating lease liabilities$19,973 $19,081 
FinanceCurrent maturities of long-term debt and finance lease obligations39,080 16,960 
Noncurrent
OperatingNoncurrent operating lease liabilities94,972 115,067 
FinanceLong-term debt and finance lease obligations455,248 301,532 
Total lease liabilities$609,273 $452,640 
Weighted-average remaining lease term
Operating leases7.0 years7.7 years
Finance leases7.8 years7.8 years
Weighted-average discount rate
Operating leases5.4 %5.4 %
Finance leases5.9 %5.2 %
Schedule of Cash Flow, Supplemental Disclosures
The table below presents supplemental cash flow information related to leases during the year ended December 31.

Year Ended December 31,
(in thousands)20222021
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows for operating leases$25,775 $18,987 
Operating cash flows for finance leases22,366 10,697 
Financing cash flows for finance leases16,621 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, 2022.

(in thousands)Operating LeasesFinance Leases
2023$25,549 $66,751 
202425,241 51,408 
202523,158 51,408 
202613,184 51,108 
202710,955 51,108 
Thereafter38,362 402,094 
Total lease payments136,449 673,877 
Less imputed interest(21,504)(179,549)
Total lease obligations114,945 494,328 
Less current obligations(19,973)(39,080)
Long-term lease obligations$94,972 $455,248