Balance Sheet Information (Tables)

9 Months Ended

12 Months Ended

Jun. 30, 2025

Sep. 30, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet

Certain significant amounts included in the condensed consolidated balance sheets consisted of the following (in thousands):


	June 30, 2025			September 30, 2024
Expendable parts and supplies, net:
Expendable parts and supplies	$	23,441		$	39,089
Less: expendable parts warranty		(4,355	)		(6,079	)
Less: obsolescence		(2,914	)		(4,738	)

	$	16,172		$	28,272

Property and equipment, net:
Aircraft and other flight equipment	$	50,104		$	591,421
Other equipment		9,588			9,503

Total property and equipment		59,692			600,924
Less: accumulated depreciation		(27,842	)		(174,573	)

	$	31,850		$	426,351

Other assets:
Investments in equity securities	$	350		$	300
Lease incentives		—			812
Contract asset		4,441			6,081
Other		675			516

	$	5,466		$	7,709

Other accrued expenses:
Accrued property taxes	$	2,483		$	4,650
Accrued interest		1,029			2,997
Accrued vacation		6,497			7,421
Accrued lodging		4,092			4,433
Accrued maintenance		1,415			2,493
Accrued employee benefits		1,550			1,075
Accrued fleet operating expense		412			2,751
Other		5,537			6,488

	$	23,015		$	32,308

Other noncurrent liabilities:
Warrant liabilities	$	100		$	25,225
Lease incentive obligations		—			1,050
Long-term employee benefits		1,737			485
Other		—			1,819

	$	1,837		$	28,579

Certain significant amounts included in the Company’s consolidated balance sheets as of September 30, 2024 and 2023, consisted of the following (in thousands):


	September 30, 2024			September 30, 2023
Expendable parts and supplies, net:
Expendable parts and supplies	$	39,089		$	39,630
Less: expendable parts warranty		(6,079	)		(6,295	)
Less: obsolescence		(4,738	)		(4,090	)

	$	28,272		$	29,245

Prepaid expenses and other current assets:
Prepaid aviation insurance	$	740		$	3,176
Prepaid vendors		966			143
Prepaid other insurance		1,066			1,205
Lease incentives		143			1,125
Prepaid fuel and other		456			1,645

	$	3,371		$	7,294

Property and equipment, net:
Aircraft and other flight equipment	$	591,421		$	1,039,782
Other equipment		9,503			9,421

Total property and equipment		600,924			1,049,203
Less: accumulated depreciation		(174,573	)		(351,181	)

	$	426,351		$	698,022

Other assets:
Investments in equity securities	$	300		$	20,320
Lease incentives		812			954
Contract asset		6,081			8,756
Other		516			516

	$	7,709		$	30,546


	September 30, 2024		September 30, 2023
Other accrued expenses:
Accrued property taxes	$	4,650	$	5,281
Accrued interest		2,997		3,447
Accrued vacation		7,421		6,763
Accrued lodging		4,433		3,984
Accrued maintenance		2,493		2,117
Accrued employee benefits		1,075		1,450
Accrued fleet operating expense		2,751		650
Other		6,488		3,309

	$	32,308	$	27,001

Other noncurrent liabilities:
Warrant liabilities	$	25,225	$	25,225
Lease incentive obligations		1,050		1,050
Long-term employee benefits		485		429
Other		1,819		1,818

	$	28,579	$	28,522