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Accrued Liabilities (Tables)
12 Months Ended
Dec. 31, 2022
Payables and Accruals [Abstract]  
Accrued Liabilities Included in Other Current Liabilities
Accrued liabilities included in other current liabilities as of December 31, 2022 and 2021 consist of the following:

 As of December 31,
20222021
(in thousands)
Salaries, wages and benefits$154,881 $142,893 
Federal excise and other passenger taxes and fees payable96,424 77,409 
Airport obligations84,928 85,772 
Fuel76,979 55,103 
Aircraft maintenance59,243 39,178 
Interest payable32,613 24,526 
Aircraft and facility lease obligations22,068 23,049 
Other29,194 32,824 
Other current liabilities$556,330 $480,754