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Long-Term Debt, Finance Leases, and Other Borrowings (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Sep. 30, 2024
Debt Disclosure [Abstract] |  |
Schedule of Long-term Debt | Long-term debt as of June 30, 2025 and September 30, 2024, consisted of the following (in thousands):
|  | June 30, 2025 |  |  | September 30, 2024 |
Notes payable to secured parties, due in semi-annual installments, interest based on SOFR plus interest spread at 4.75% to 6.25% through 2028, collateralized by the underlying aircraft |  | $ | — |  |  | $ | 85,469 |
Notes payable to secured parties, due in quarterly installments, interest based on SOFR plus interest at spread 2.20% to 2.32% for senior note & 4.50% for subordinated note through 2028, collateralized by the underlying aircraft |  |  | — |  |  |  | 73,884 |
Revolving credit facility, quarterly interest based on SOFR plus interest spread at 4.50% through 2028 |  |  | 33,018 |  |  |  | 37,520 |
Other obligations due to financial institution, monthly and/or quarterly interest due from 2022 through 2031, collateralized by the underlying equipment |  |  | — |  |  |  | 4,681 |
Notes payable to the UST, quarterly interest based on SOFR plus interest spread at 3.50% through 2025 |  |  | 80,726 |  |  |  | 113,656 |
Gross long-term debt, including current maturities |  |  | 113,744 |  |  |  | 315,210 |
Less unamortized debt issuance costs |  |  | — |  |  |  | (2,395 | )
Less notes payable warrants |  |  | (774 | ) |  |  | (2,544 | )
Net long-term debt, including current maturities |  |  | 112,970 |  |  |  | 310,271 |
Less current portion, net of unamortized debt issuance costs |  |  | (84,725 | ) |  |  | (50,455 | )
Net long-term debt |  | $ | 28,245 |  |  | $ | 259,816 |
| Long-term debt as of September 30, 2024 and 2023, consisted of the following (in thousands):
|  | September 30, 2024 |  |  | September 30, 2023 |
Senior and subordinated notes payable to secured parties, due in monthly installments, interest based on SOFR plus interest spread at 2.71% through 2027, collateralized by the underlying aircraft |  | $ | — |  |  | $ | 39,018 |
Notes payable to secured parties, due in semi-annual installments, interest based on fixed interest of 4.75% to 6.25% through 2028, collateralized by the underlying aircraft |  |  | 85,469 |  |  |  | 108,815 |
Notes payable to secured parties, due in quarterly installments, interest based on SOFR plus interest at spread 2.20% to 2.32% for senior note & 4.50% for subordinated note through 2028, collateralized by the underlying aircraft |  |  | 73,884 |  |  |  | 90,401 |
United Revolving credit facility, quarterly interest based on SOFR plus interest spread at 4.50% through 2028 |  |  | 37,520 |  |  |  | 40,630 |
United Bridge Loan—due in quarterly installments based on SOFR plus interest spread at 4.50% through 2024 |  |  | — |  |  |  | 10,500 |
Other obligations due to financial institution, monthly and/or quarterly interest due from 2022 through 2027, collateralized by the underlying equipment |  |  | 4,681 |  |  |  | 67,637 |
Notes payable to financial institution, due in monthly installments, interest based on SOFR plus interest spread at 3.10% through 2024, collateralized by the underlying equipment |  |  | — |  |  |  | 1,075 |
|  | September 30, 2024 |  |  | September 30, 2023 |
Notes payable to financial institution, due in monthly installments, interest based on fixed interest of 7.50%, through 2027, collateralized by the underlying equipment |  |  | — |  |  |  | 41,098 |
Notes payable to the UST, quarterly interest based on SOFR plus interest spread at 3.50% through 2025 |  |  | 113,656 |  |  |  | 139,100 |
Gross long-term debt, including current maturities |  |  | 315,210 |  |  |  | 538,274 |
Less unamortized debt issuance costs |  |  | (2,395 | ) |  |  | (5,083 | )
Less notes payable warrants |  |  | (2,544 | ) |  |  | (4,913 | )
Net long-term debt, including current maturities |  |  | 310,271 |  |  |  | 528,278 |
Less current portion, net of unamortized debt issuance costs |  |  | (50,455 | ) |  |  | (163,550 | )
Net long-term debt |  | $ | 259,816 |  |  | $ | 364,728 |
Schedule of Principal Maturities of Long-term Debt | Principal maturities of long-term debt as of June 30, 2025, and for each of the next five years are as follows (in thousands):
Periods Ending September 30, |  | Total Principal |
2025 (remainder of) |  | $ | — |
2026 |  |  | 86,538 |
2027 |  |  | 6,190 |
2028 |  |  | 4,782 |
2029 |  |  | 16,234 |
|  | $ | 113,744 |
| Principal maturities of long-term debt as of September 30, 2024, and for each of the next five years are as follows (in thousands):
Periods Ending September 30, |  | Total Principal |
2025 |  | $ | 51,085 |
2026 |  |  | 166,454 |
2027 |  |  | 52,552 |
2028 |  |  | 30,869 |
2029 |  |  | 14,250 |
|  | $ | 315,210 |

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