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Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Passenger Revenue	$ 902,187	$ 1,682,955	$ 1,533,701
Contract with Customer, Liability, Forward Bookings	27.90%
Contract with Customer, Liability, Credit Voucher Bookings	72.10%
Air Traffic Liability, Recognized	$ 201,000
Air Traffic Liability, Current		250,000
Revenue from Contract with Customer, Duration	12 months
Scheduled Service Revenue
Disaggregation of Revenue [Line Items]
Passenger Revenue	$ 435,668	897,631	898,653
Air-related revenue
Disaggregation of Revenue [Line Items]
Passenger Revenue	453,545	770,206	621,939
Co-brand Revenue
Disaggregation of Revenue [Line Items]
Passenger Revenue	$ 12,974	$ 15,118	$ 13,109

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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