Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Current assets:
Cash and cash equivalents	$ 56,077	$ 57,683
Restricted cash	3,343	3,342
Receivables, net	13,115	3,978
Expendable parts and supplies, net	25,509	26,715
Prepaid expenses and other current assets	3,953	6,616
Total current assets	101,997	98,334
Property and equipment, net	945,545	865,254
Intangible assets, net		3,842
Lease and equipment deposits	1,781	6,085
Operating lease right-of-use assets	11,896	43,090
Deferred heavy maintenance, net	10,311	9,707
Assets held for sale	73,000	73,000
Other assets	14,984	16,290
Total assets	1,159,514	1,115,602
Current liabilities:
Current portion of long-term debt and finance leases	88,802	97,218
Current portion of deferred revenue	1,204	385
Current maturities of operating leases	5,354	17,233
Accounts payable	51,257	59,386
Accrued compensation	9,097	11,255
Other accrued expenses	30,561	29,000
Total current liabilities	186,275	214,477
Noncurrent liabilities:
Long-term debt and finance leases, excluding current portion	597,816	502,517
Noncurrent operating lease liabilities	9,533	16,732
Deferred credits	2,869	3,082
Deferred income taxes	16,705	17,719
Deferred revenue, net of current portion	17,607	23,682
Other noncurrent liabilities	28,938	29,219
Total noncurrent liabilities	673,468	592,951
Total liabilities	859,743	807,428
Commitments and contingencies (Note 16)
Stockholders' equity:
Common stock of no par value and additional paid-in capital, 125,000,000 shares authorized; 36,378,550 (2023) and 36,376,897 (2022) shares issued and outstanding, 4,899,497 (2023) and 4,899,497 (2022) warrants issued and outstanding	259,864	259,177
Retained earnings	39,907	48,997
Total stockholders' equity	299,771	308,174
Total liabilities and stockholders' equity	$ 1,159,514	$ 1,115,602