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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2021
Sep. 30, 2021
Current assets:    
Cash and cash equivalents $ 102,332 $ 120,517
Restricted cash 3,350 3,350
Receivables, net 2,919 3,167
Expendable parts and supplies, net 25,206 24,467
Prepaid expenses and other current assets 4,488 6,885
Total current assets 138,295 158,386
Property and equipment, net 1,157,922 1,151,891
Intangible assets, net 6,537 6,792
Lease and equipment deposits 8,249 6,808
Operating lease right-of-use assets 88,469 93,100
Deferred heavy maintenance, net 3,271 3,499
Other assets 31,752 36,121
Total assets 1,434,495 1,456,597
Current liabilities:    
Current portion of long-term debt and finance leases 111,059 111,710
Current portion of deferred revenue 5,528 6,298
Current maturities of operating leases 26,935 32,652
Accounts payable 62,933 61,476
Accrued compensation 7,638 12,399
Other accrued expenses 36,283 33,657
Total current liabilities 250,376 258,192
Noncurrent liabilities:    
Long-term debt and finance leases, excluding current portion 547,409 539,700
Noncurrent operating lease liabilities 34,405 33,991
Deferred credits 3,721 3,934
Deferred income taxes 65,716 69,940
Deferred revenue, net of current portion 24,788 28,202
Other noncurrent liabilities 33,606 34,591
Total noncurrent liabilities 709,645 710,358
Total liabilities 960,021 968,550
Commitments and contingencies (Note 15)
Stockholders' equity:    
Preferred stock of no par value, 5,000,000 shares authorized; no shares issued and outstanding
Common stock of no par value and additional paid-in capital, 125,000,000 shares authorized; 35,963,984 (2022) and 35,958,759 (2021) shares issued and outstanding, 4,899,497 (2022) and 4,899,497 (2021) warrants issued and outstanding 257,073 256,372
Retained earnings 217,401 231,675
Total stockholders' equity 474,474 488,047
Total liabilities and stockholders' equity $ 1,434,495 $ 1,456,597