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Long-Term Debt, Finance Leases, and Other Borrowings (Tables) | 12 Months Ended
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Sep. 30, 2023
Debt Disclosure [Abstract] |
Schedule of Long-term Debt | Long-term debt as of September 30, 2023 and 2022, consisted of the following (in thousands):
|  | September 30, |  |  | September 30, |
|  | 2023 |  |  | 2022 |
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 |  |  | $ | 73,850 |
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 |  |  | 108,815 |  |  |  | 131,010 |
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 |  |  | 90,401 |  |  |  | 106,865 |
Revolving credit facility, quarterly interest based on SOFR plus interest spread at 4.50% through 2028, with incentives for up to $15 million based on achieving certain performance metrics |  | 40,630 |  |  |  | 15,630 |
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 2031, collateralized by the underlying equipment |  |  | 67,637 |  |  |  | 18,038 |
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 |  |  |  | 26,758 |
Notes payable to financial institution, due in monthly installments, plus interest spread at 5.00% through 2023, secured by flight equipment |  |  | — |  |  |  | 2,000 |
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 |  |  |  | 36,212 |
Notes payable to financial institution, quarterly interest based on SOFR plus interest spread at 3.50% through 2027 |  |  | 139,100 |  |  |  | 204,947 |
Gross long-term debt, including current maturities |  |  | 538,274 |  |  |  | 615,310 |
Less unamortized debt issuance costs |  |  | (5,083 | ) |  |  | (8,303 | )
Less notes payable warrants |  |  | (4,913 | ) |  |  | (7,272 | )
Net long-term debt, including current maturities |  |  | 528,278 |  |  |  | 599,735 |
Less current portion, net of unamortized debt issuance costs |  |  | (163,550 | ) |  |  | (97,218 | )
Net long-term debt |  | $ | 364,728 |  |  | $ | 502,517 |
Schedule of Principal Maturities of Long-term Debt | Principal maturities of long-term debt as of September 30, 2023, and for each of the next five years are as follows (in thousands):
Periods Ending June 30, |  | Total Principal |
2024 |  | $ | 164,807 |
2025 |  |  | 57,840 |
2026 |  |  | 199,234 |
2027 |  |  | 63,672 |
2028 |  |  | 36,322 |
Thereafter |  |  | 16,399 |
|  | $ | 538,274 |

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