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Consolidated Balance Sheets - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Current assets:    
Cash and cash equivalents $ 120,517 $ 99,395
Restricted cash 3,350 3,446
Receivables, net 3,167 13,712
Expendable parts and supplies, net 24,467 22,971
Prepaid expenses and other current assets 6,885 16,067
Total current assets 158,386 155,591
Property and equipment, net 1,151,891 1,212,415
Intangible assets, net 6,792 8,032
Lease and equipment deposits 6,808 1,899
Operating lease right-of-use assets 93,100 123,251
Deferred heavy maintenance, net 3,499  
Other assets 36,121 742
Total assets 1,456,597 1,501,930
Current liabilities:    
Current portion of long-term debt and finance leases 111,710 189,268
Current portion of deferred revenue 6,298 9,389
Current maturities of operating leases 32,652 43,932
Accounts payable 61,476 53,229
Accrued compensation 12,399 12,030
Other accrued expenses 33,657 45,478
Total current liabilities 258,192 353,326
Long-term debt and finance leases, excluding current portion 539,700 542,456
Noncurrent operating lease liabilities 33,991 62,531
Deferred credits 3,934 5,705
Deferred income taxes 69,940 64,275
Deferred revenue, net of current portion 28,202 14,369
Other noncurrent liabilities 34,591 1,409
Total noncurrent liabilities 710,358 690,745
Total liabilities 968,550 1,044,071
Commitments and contingencies (Note 16)
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; 35,958,759 (2021) and 35,526,918 (2020) shares issued and outstanding, and 4,899,497 (2021) and 0 (2020) warrants issued and outstanding 256,372 242,772
Retained earnings 231,675 215,087
Total stockholders' equity 488,047 457,859
Total liabilities and stockholders' equity $ 1,456,597 $ 1,501,930