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Revenue Recognition (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 01, 2021	Apr. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax			$ 423,796	$ 181,916	$ 1,124,237	$ 677,347
Credit Voucher Term Expiration		2 years
Subsequent Event
Disaggregation of Revenue [Line Items]
Credit Voucher Term Expiration	1 year
Scheduled Service Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax			195,225	79,464	552,765	325,404
Air-related revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax			224,170	100,262	558,687	342,520
Co-brand Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax			$ 4,401	$ 2,190	$ 12,785	$ 9,423

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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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