Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 01, 2023 USD ($)	Oct. 31, 2020 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) aircraft	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Feb. 28, 2023	Feb. 27, 2023	Nov. 04, 2022 USD ($)	Oct. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Summary of Significant Accounting Policies [Line Items]
Concentration risk					10.00%
Revenue from contract with customers amount of consideration receivable due for settlement			$ 30,149		$ 30,149
Receivables, net			40,391		40,391		$ 40,341
Payments for proceeds from incentives and penalties			(6)	$ 2,137	1,236	$ 5,443
Contract liabilities			0		0		1,985
Deferred fixed revenue			0		0		16,561
Fulfillment costs	$ 774
Reimbursable costs			6,537	3,310	18,511	10,589
Amortization expense related to fulfillment costs			33	0	54	0
Short-term contract assets			1,618		1,618		0
Cash settlement payment		$ 670
Note receivable		$ 11,048	11,048		11,048
Cash received for opening of a crew base											$ 294
Revenue related to performance obligation			0	5,138	1,641	12,746
Undisputed notes receivables										$ 50,126
Interest rate								12.00%	4.50%
Interest receivable			1,034		1,034
Restricted cash			707		707		849
Marketable securities			136,562		136,562		153,827
Construction in process			2,741		2,741		2,237
Depreciation expense			6,365	6,224	18,928	18,656
Cash and cash equivalents			15,839		15,839		33,333
Operating expenses			55,128	55,910	180,159	164,994
Allowance for expected credit losses			10		10		18
Air Wisconsin
Summary of Significant Accounting Policies [Line Items]
Deferred upfront fee revenue							0
Customer Concentration Risk
Summary of Significant Accounting Policies [Line Items]
Receivables, net			40,391		40,391
United Airlines
Summary of Significant Accounting Policies [Line Items]
Receivables, net			30,543		30,543		29,770
American Airlines
Summary of Significant Accounting Policies [Line Items]
Receivables, net			608		608
October 2020 Amendment
Summary of Significant Accounting Policies [Line Items]
Fixed revenues previously deferred			0	453	649	1,611
Deferred upfront fee revenue			0		0		1,335
Deferred payment												$ 4,410
Deferred revenue											$ 73
Related Party
Summary of Significant Accounting Policies [Line Items]
Notes receivable			21,093		21,093
Related Party | Air Wisconsin
Summary of Significant Accounting Policies [Line Items]
Receivables, net			29,509		29,509
Contract liabilities			0		0		2,307
Fixed revenues previously deferred			0	5,180	16,561	22,548
Upfront fee			0	932	1,335	3,314
Fulfillment costs			0	100	143	355
Deferred upfront fee revenue			3,680		3,680
Reimbursable costs					602
Estimated non-refundable upfront fee revenue					4,600
Non-refundable upfront fee revenues			193	0	319	0
Revenue related to one-time assistance payment, estimated monthly support fee and heavy maintenance revenues			$ 1,946	$ 0	$ 3,206	$ 0
Revenue Benchmark
Summary of Significant Accounting Policies [Line Items]
Concentration risk			0.10%	99.90%	50.10%	99.90%
Revision of prior period, reclassification, adjustment
Summary of Significant Accounting Policies [Line Items]
Operating expenses				$ 892		$ 1,796
American Capacity Purchase Agreement
Summary of Significant Accounting Policies [Line Items]
Contract with customers liability revenue recognized			$ 0		$ 0
American Capacity Purchase Agreement | Monthly Support Fee And Anticipated Heavy Maintenance Reimbursements
Summary of Significant Accounting Policies [Line Items]
Short-term contract assets			2,259		2,259		0
Accounts receivable set off against contract with customers liability non current			247		247		0
American Capacity Purchase Agreement | Related Party | Air Wisconsin
Summary of Significant Accounting Policies [Line Items]
Receivables, net			$ 608		608
Reimbursable costs					$ 3,998
American Capacity Purchase Agreement | Revenue Benchmark
Summary of Significant Accounting Policies [Line Items]
Concentration risk			99.70%		49.70%
American Capacity Purchase Agreement | Revenue Benchmark | Customer Concentration Risk
Summary of Significant Accounting Policies [Line Items]
Concentration risk percentage			99.70%		49.70%
American Capacity Purchase Agreement | American Airlines | Related Party | Air Wisconsin
Summary of Significant Accounting Policies [Line Items]
Number of aircrafts operated | aircraft					45
United Capacity Purchase Agreement
Summary of Significant Accounting Policies [Line Items]
Contract with customers liability revenue recognized			$ 0		$ 1,985
United Capacity Purchase Agreement | Revenue Benchmark
Summary of Significant Accounting Policies [Line Items]
Concentration risk			0.10%		50.10%
Short-Term Contract with Customer
Summary of Significant Accounting Policies [Line Items]
Fulfillment costs					$ 108		0
Deferred upfront fee revenue			$ 641		641		0
Long-Term Contract with Customer
Summary of Significant Accounting Policies [Line Items]
Fulfillment costs					613		0
Deferred non-refundable upfront fee revenue			$ 3,039		$ 3,039		$ 0