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Balance Sheet Information | 3 Months Ended
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Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Balance Sheet Information | 7. Balance Sheet Information 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 |
Depreciation Expense on Property and Equipment Depreciation expense on property and equipment totaled $8.0 million and $13.3 million for the three months ended December 31, 2024 and 2023, respectively, and $40.0 million, $60.2 million, and $80.5 million for the fiscal years ended September 30, 2024, 2023, and 2022, respectively. Other Assets In connection with a negotiated forward purchase contract for electrically-powered vertical takeoff and landing aircraft (“eVTOL aircraft”) executed in February 2021, we obtained equity warrant assets giving us the right to acquire a number shares of common stock in Archer Aviation, Inc. (“Archer”), which at the time of our initial investment was a private, venture-backed company. As the initial investment in Archer did not have a readily determinable fair value, we accounted for this investment using the measurement alternative under ASC 321, Investments – Equity Securities, and measured the investments at cost less impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar investments from the same issuer. We estimated the initial equity warrant asset value to be $16.4 million based on publicly available information as of the grant date. In September 2021, the merger between Archer and a special purpose acquisition company (“SPAC”) was completed, resulting in a readily determinable fair value of our investments in Archer. Accordingly, gains and losses associated with changes in the fair value of our investments in Archer are reported in earnings, in accordance with ASC 321. The initial grant date value of the warrants, $16.4 million, was recognized as a vendor credit liability within other noncurrent liabilities. The liability related to the warrant assets will be settled in the future, as a reduction of the acquisition date value of the eVTOL aircraft contemplated in the related aircraft purchase agreement. In connection with closing of the merger between Archer and the SPAC described above, in September 2021, we purchased 500,000 Class A common shares in Archer for $5.0 million and obtained an additional warrant to purchase shares of Archer with a total grant date value of $5.6 million. The initial value of the warrants was recognized as a vendor credit liability within other noncurrent liabilities, and will be settled in the future, as a reduction of the acquisition date value of the eVTOL aircraft contemplated in the related aircraft purchase agreement. Because these investments have readily determinable fair values, gains and losses resulting from changes in fair value of the investments are reflected in earnings, in accordance with ASC 321. All of our vested warrants have been exercised into shares of Archer common stock. The fair values of the Company’s investments in Archer are Level 1 within the fair value hierarchy as the values are determined using quoted prices for the equity securities. The Company recorded a $2.7 million unrealized loss and a $5.6 million unrealized gain on the investment in Archer during the fiscal years ended September 30, 2024 and 2023, respectively. During the fiscal year ended September 30, 2024, the Company sold substantially all of its shares of Archer for approximately $9.6 million in proceeds and recorded a $0.8 million gain on the sale. In connection with a negotiated forward purchase contract for fully electric aircraft executed in July 2021, we obtained $5.0 million of preferred stock in Heart Aerospace Incorporated (“Heart”), a privately held company. Our investment in Heart does not have a readily determinable fair value, so we account for the investment using the measurement alternative under ASC 321 and measure the investment at initial cost less impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar investments from the same issuer. We consider a range of factors when adjusting the fair value of these investments, including, but not limited to, the term and nature of the investment, local market conditions, values for comparable securities, current and projected operating performance, financing transactions subsequent to the acquisition of the investment, or other features that indicate a change to fair value is warranted. Any changes in fair value from the initial cost of the investment in preferred stock are recognized as increases or decreases on our balance sheet and as net gains or losses on investments in equity securities. The initial investment in preferred stock was measured at cost of $5.0 million. During the fiscal year ended September 30, 2024, the Company transferred its vested investment in Heart to United in exchange for $12.6 million in debt reduction, and realized a gain on the investment of $7.2 million, net of transaction costs. In connection with a negotiated forward purchase contract for hybrid-electric vertical takeoff and landing (“VTOL”) aircraft executed in February 2022, we obtained a warrant giving us the right to acquire a number of shares of common stock in the privately-held manufacturer of the VTOL aircraft. These investments did not have a readily determinable fair value, so we originally accounted for them using the measurement alternative under ASC 321, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar investments from the same issuer. We estimated the initial warrant asset value to be $3.2 million based on prices of similar investments in the same issuer. The grant date value of the warrants, $3.2 million, was recognized as a vendor credit liability within other noncurrent liabilities. The liability related to the warrant assets will be settled in the future, as a reduction of the acquisition date value of the VTOL aircraft contemplated in the related forward purchase agreement. On March 12, 2024, the privately-held manufacturer of the VTOL aircraft, XTI Aerospace, Inc. ("XTIA"), and its merger subsidiary completed their merger agreement, and began trading as XTIA on the Nasdaq Composite on March 13, 2024, resulting in a readily determinable fair value on our investment in XTIA. The fair values of the Company's investments in XTIA are now Level 1 within the fair value hierarchy as the values are determined using quoted prices for the equity securities. The Company recorded a $42 thousand and $3.5 million unrealized loss on the investment in XTIA during the three months ended December 31, 2024 and fiscal year ended September 30, 2024, respectively. Total net unrealized (loss)/gain on our investments in equity securities totaled $(42) thousand and $2.5 million for the three months ended December 31, 2024 and 2023, respectively, and $(6.1) million, $5.4 million, and $(13.7) million for the fiscal years ended September 30, 2024, 2023, and 2022 respectively, and are reflected in unrealized (loss)/gain on investments, net in our condensed consolidated statements of operations and comprehensive loss. Total realized gain on our investments in equity securities totaled $8.0 million, net of transaction costs, for the fiscal year ended September 30, 2024, and are reflected in gain on investments in our condensed consolidated statements of operation and comprehensive loss. There was no realized gain or loss on investments in equity securities during the three months ended December 31, 2024 and 2023 or fiscal years ended September 30, 2023 and 2022. As of December 31, 2024 and September 30, 2024 and 2023, the aggregate carrying amount of our investments in equity securities was $0.3 million, $0.3 million, and $20.3 million, respectively, and the carrying amount of our investments without readily determinable fair values was $0.3 million, $0.3 million, and $8.8 million, respectively.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/210/tableOfContent + Details
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