Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Salaries, wages and benefits	$ 142,893	$ 112,838
Airport obligations	85,772	68,677
Federal excise and other passenger taxes and fees payable	77,409	36,884
Fuel	55,103	11,704
Aircraft maintenance	39,178	27,466
Interest payable	24,526	37,202
Aircraft and facility lease obligations	23,049	67,374
Other	32,824	31,469
Other current liabilities	$ 480,754	$ 393,614

Accrued Aircraft Maintenance Liabilities, Current

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Accrued Airport Liabilities, Current

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Accrued Fuel Costs, Current

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Federal Excise and Other Passenger Taxes and Fees Payable, Current

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for contractual rent under lease arrangements. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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