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Balance Sheet Information (Tables) | 12 Months Ended
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Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Summary of Certain Significant Amounts Included in Consolidated Balance Sheets | Certain significant amounts included in the Company's consolidated balance sheets as of September 30, 2023 and 2022, consisted of the following (in thousands):
|  | September 30, |  |  | September 30, |
|  | 2023 |  |  | 2022 |
Expendable parts and supplies, net: |  |  |  |  |  |
Expendable parts and supplies |  | $ | 39,630 |  |  | $ | 31,913 |
Less: expendable parts warranty |  |  | (6,295 | ) |  |  | (1,373 | )
Less: obsolescence |  |  | (4,090 | ) |  |  | (3,825 | )
|  | $ | 29,245 |  |  | $ | 26,715 |
Prepaid expenses and other current assets: |  |  |  |  |  |
Prepaid aviation insurance |  | $ | 3,176 |  |  | $ | 2,618 |
Prepaid vendors |  |  | 143 |  |  |  | 1,310 |
Prepaid other insurance |  |  | 1,205 |  |  |  | 1,268 |
Lease incentives |  |  | 1,125 |  |  |  | 352 |
Prepaid fuel and other |  |  | 1,645 |  |  |  | 1,068 |
|  | $ | 7,294 |  |  | $ | 6,616 |
Property and equipment, net: |  |  |  |  |  |
Aircraft and other flight equipment |  | $ | 1,039,782 |  |  | $ | 1,260,143 |
Other equipment |  |  | 9,421 |  |  |  | 10,420 |
Total property and equipment |  |  | 1,049,203 |  |  |  | 1,270,563 |
Less: accumulated depreciation |  |  | (351,181 | ) |  |  | (405,309 | )
|  | $ | 698,022 |  |  | $ | 865,254 |
Other assets: |  |  |  |  |  |
Investments in equity securities |  | $ | 20,320 |  |  | $ | 15,178 |
Lease incentives |  |  | 954 |  |  |  | 1,097 |
Contract asset |  |  | 8,756 |  |  |  | — |
Other |  |  | 516 |  |  |  | 15 |
|  | $ | 30,546 |  |  | $ | 16,290 |
Other accrued expenses: |  |  |  |  |  |
Accrued property taxes |  | $ | 5,281 |  |  | $ | 5,866 |
Accrued interest |  |  | 3,447 |  |  |  | 2,882 |
Accrued vacation |  |  | 6,763 |  |  |  | 4,746 |
Accrued lodging |  |  | 3,984 |  |  |  | 3,795 |
Accrued maintenance |  |  | 2,117 |  |  |  | 1,453 |
Accrued liability on government payroll program |  |  | — |  |  |  | 2,967 |
Accrued simulator costs |  |  | 1,006 |  |  |  | 1,045 |
Accrued employee benefits |  |  | 1,450 |  |  |  | 1,679 |
Accrued fleet operating expense |  |  | 650 |  |  |  | 1,606 |
Short term lease incentive liability |  |  | 97 |  |  |  | 97 |
Other |  |  | 2,206 |  |  |  | 2,864 |
|  | $ | 27,001 |  |  | $ | 29,000 |
Other noncurrent liabilities: |  |  |  |  |  |
Warrant liabilities |  | $ | 25,225 |  |  | $ | 25,225 |
Lease incentive obligations |  |  | 1,050 |  |  |  | 1,050 |
Long-term employee benefits |  |  | 429 |  |  |  | 1,123 |
Other |  |  | 1,818 |  |  |  | 1,821 |
|  | $ | 28,522 |  |  | $ | 29,219 |

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- Definition Tabular disclosure of condensed balance sheet, including, but not limited to, balance sheets of consolidated entities and consolidation eliminations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 04 -Paragraph (a) -Publisher SEC Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-3 + Details
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