Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2019

Payables and Accruals [Abstract]

Accrued liabilities included in other current liabilities

Accrued liabilities included in other current liabilities as of December 31, 2019 and 2018 consist of the following:

	As of December 31,
	2019		2018
	(in thousands)
Salaries and wages	$	89,163	$	82,900
Airport obligations	80,134		52,029
Federal excise and other passenger taxes and fees payable	65,312		60,604
Aircraft maintenance	38,099		59,805
Fuel	28,510		25,368
Aircraft and facility lease obligations	20,656		15,149
Interest payable	16,941		18,086
Other	34,706		25,736
Other current liabilities	$	373,521	$	339,677