Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Operating revenues:
Contract revenue	$ 147,173	$ 147,757
Operating expenses:
Flight operations	58,320	47,598
Maintenance	48,287	58,981
Aircraft rent	4,083	9,586
General and administrative	13,988	12,578
Depreciation and amortization	15,203	21,028
Intangible asset impairment	3,719
Other operating expenses	1,126	1,972
Total operating expenses	144,726	151,743
Operating income (loss)	2,447	(3,986)
Other income (expense), net:
Interest expense	(11,276)	(7,930)
Interest income	71	51
Loss on investments, net	(1,679)	(6,462)
Other income (expense), net	417	(59)
Total other expense, net	(12,467)	(14,400)
Loss before taxes	(10,020)	(18,386)
Income tax benefit	(930)	(4,112)
Net loss and comprehensive loss	$ (9,090)	$ (14,274)
Net loss per share attributable to common shareholders
Basic	$ (0.25)	$ (0.40)
Diluted	$ (0.25)	$ (0.40)
Weighted-average common shares outstanding
Basic	36,378	35,963
Diluted	36,378	35,963
Contract Revenue
Operating revenues:
Contract revenue	$ 128,450	$ 136,894
Pass Through and Other Revenue
Operating revenues:
Contract revenue	$ 18,723	$ 10,863