Accrued Liabilities

12 Months Ended

Dec. 31, 2018

Payables and Accruals [Abstract]

Accrued Liabilities

Accrued Liabilities

Accrued liabilities included in other current liabilities as of December 31, 2018 and 2017 consist of the following:

	As of December 31,
	2018		2017
	(in thousands)
Salaries and wages	$	82,900	$	54,338
Federal excise and other passenger taxes and fees payable	60,604		42,036
Aircraft maintenance	59,805		33,033
Airport obligations	52,029		56,299
Fuel	25,368		25,171
Interest payable	18,086		11,384
Aircraft and facility lease obligations	15,149		16,992
Other	25,736		23,117
Other current liabilities	$	339,677	$	262,370