Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Oct. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2021
Summary of Significant Accounting Policies [Line Items]
Depreciation expense		$ 6,218	$ 6,246	$ 12,433	$ 12,495
Deferred Revenue, Noncurrent		27,470		27,470
Long-term note receivable		$ 55,177		$ 55,177
Notes Receivable Instrument, Interest Rate		4.50%		4.50%
Notes Receivable Instrument, Maturity Date				Feb. 28, 2023
Interest receivable		$ 3,303		$ 3,303
Deferred revenue recognized		14,588		20,909
Revenue, Performance Obligation		4,099	5,736	7,608	12,972
Cash Settlement						$ 670
Note Receivable						11,048
Payments for proceeds from incentives and penalties		2,530	1,340	3,307	3,159
Cash Received From United For The Opening Of A Crew Base	$ 294
Restricted Cash		516		516
Marketable securities		133,303		133,303			$ 138,370
Revenue from contract with customers amount of consideration receivable due for settlement		10,462		10,462
Operating Expenses		55,909	26,256	109,084	42,773
Notes Receivable [Member]
Summary of Significant Accounting Policies [Line Items]
Interest receivable		71		71
Revenue from contract with customers amount of consideration receivable due for settlement		9,109		9,109
October 2020 Amendment [Member]
Summary of Significant Accounting Policies [Line Items]
Deferred recognizing revenue	$ 73
Deferred revenue current		3,338		3,338
Deferred Revenue, Noncurrent		1,623		1,623
Deferred Cash Settlement due from United						$ 4,410
Deferred Revenue Recognition		640	324	1,159	637
Air Wisconsin [Member]
Summary of Significant Accounting Policies [Line Items]
Accounts receivable, net		14,185		14,185
Upfront fee		1,316	685	2,383	1,346
Fulfillment costs		141	73	256	144
Deferred Revenue Recognition		$ 12,632	7,440	$ 17,368	15,351
Revision of Prior Period, Reclassification, Adjustment [Member]
Summary of Significant Accounting Policies [Line Items]
Operating Expenses			$ 2,462		$ 5,080