Accrued Liabilities

12 Months Ended

Dec. 31, 2017

Payables and Accruals [Abstract]

Accrued Liabilities

Accrued Liabilities

Accrued liabilities included in other current liabilities as of December 31, 2017 and 2016 consist of the following:

	As of December 31,
	2017		2016
	(in thousands)
Salaries and wages	$	54,338	$	54,578
Airport obligations	56,299		43,989
Federal excise and other passenger taxes and fees payable	42,036		42,064
Aircraft maintenance	33,033		30,233
Fuel	25,171		14,828
Aircraft and facility lease obligations	16,992		10,378
Interest payable	11,384		8,499
Other	23,117		21,442
Other current liabilities	$	262,370	$	226,011