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Balance Sheet Information (Tables) | 3 Months Ended
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Dec. 31, 2024
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 December 31, 2024 and September 30, 2024 and 2023, consisted of the following (in thousands):
|  | December 31, |  |  | September 30, |
|  | 2024 |  |  | 2024 |  |  | 2023 |
Expendable parts and supplies, net: |  |  |  |  |  |  |  |  |
Expendable parts and supplies |  | $ | 39,404 |  |  | $ | 39,089 |  |  | $ | 39,630 |
Less: expendable parts warranty |  |  | (5,574 | ) |  |  | (6,079 | ) |  |  | (6,295 | )
Less: obsolescence |  |  | (4,658 | ) |  |  | (4,738 | ) |  |  | (4,090 | )
|  | $ | 29,172 |  |  | $ | 28,272 |  |  | $ | 29,245 |
Property and equipment, net: |  |  |  |  |  |  |  |  |
Aircraft and other flight equipment |  | $ | 319,831 |  |  | $ | 591,421 |  |  | $ | 1,039,782 |
Other equipment |  |  | 9,788 |  |  |  | 9,503 |  |  |  | 9,421 |
Total property and equipment |  |  | 329,619 |  |  |  | 600,924 |  |  |  | 1,049,203 |
Less: accumulated depreciation |  |  | (126,052 | ) |  |  | (174,573 | ) |  |  | (351,181 | )
|  | $ | 203,567 |  |  | $ | 426,351 |  |  | $ | 698,022 |
Other assets: |  |  |  |  |  |  |  |  |
Investments in equity securities |  | $ | 300 |  |  | $ | 300 |  |  | $ | 20,320 |
Lease incentives |  |  | — |  |  |  | 812 |  |  |  | 954 |
Contract asset |  |  | 5,400 |  |  |  | 6,081 |  |  |  | 8,756 |
Other |  |  | 1,129 |  |  |  | 516 |  |  |  | 516 |
|  | $ | 6,829 |  |  | $ | 7,709 |  |  | $ | 30,546 |
Other accrued expenses: |  |  |  |  |  |  |  |  |
Accrued property taxes |  | $ | 4,722 |  |  | $ | 4,650 |  |  | $ | 5,281 |
Accrued interest |  |  | 3,207 |  |  |  | 2,997 |  |  |  | 3,447 |
Accrued vacation |  |  | 7,308 |  |  |  | 7,421 |  |  |  | 6,763 |
Accrued lodging |  |  | 3,847 |  |  |  | 4,433 |  |  |  | 3,984 |
Accrued maintenance |  |  | 1,911 |  |  |  | 2,493 |  |  |  | 2,117 |
Accrued employee benefits |  |  | 1,528 |  |  |  | 1,075 |  |  |  | 1,450 |
Accrued fleet operating expense |  |  | 3,118 |  |  |  | 2,751 |  |  |  | 650 |
Other |  |  | 8,841 |  |  |  | 6,488 |  |  |  | 3,309 |
|  | $ | 34,482 |  |  | $ | 32,308 |  |  | $ | 27,001 |
Other noncurrent liabilities: |  |  |  |  |  |  |  |  |
Warrant liabilities |  | $ | 25,225 |  |  | $ | 25,225 |  |  | $ | 25,225 |
Lease incentive obligations |  |  | — |  |  |  | 1,050 |  |  |  | 1,050 |
Long-term employee benefits |  |  | 537 |  |  |  | 485 |  |  |  | 429 |
Other |  |  | 913 |  |  |  | 1,819 |  |  |  | 1,818 |
|  | $ | 26,675 |  |  | $ | 28,579 |  |  | $ | 28,522 |

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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 942 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4 Reference 4: 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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