Subsequent Events	12 Months Ended
Sep. 30, 2023
Subsequent Events [Abstract]
Subsequent Events	18. Subsequent Events United Agreements On January 11, 2024 and January 19, 2024, we entered into the First Amendment to our Third Amended and Restated United CPA and the Second Amendment to our Third Amended and Restated United CPA (the "January 2024 United CPA Amendments"), respectively. The January 2024 United CPA Amendments provide additional liquidity and certain other amendments described below • Increased CPA rates, retroactive to October 1, 2023 through December 31, 2024, which are projected to generate approximately $63.5 million in incremental revenue over the next twelve months. • Amended certain notice requirements for removal by United of up to eight CRJ-900 Covered Aircraft (as defined in the United CPA) from the United CPA. • Extended United's existing utilization waiver for the Company's operation of E-175 and CRJ-900 Covered Aircraft (as defined in the United CPA) to June 30, 2024. On January 11, 2024 and January 19, 2024, we entered into Amendment No. 4 to our Second Amended and Restated Credit and Guaranty Agreement, Amendment No. 1 to Stock Pledge Agreement and Limited Waiver of Conditions to Credit Extension ("Amendment No. 4") and Waiver and Amendment No. 5 to our Second Amended and Restated Credit and Guaranty Agreement (collectively, the "January 2024 Credit Agreement Amendments"), respectively. The January 2024 Credit Agreement Amendments provide for the following: • The repayment in full of the Company's $10.5 million Effective Date Bridge Loan obligations, and the prepayment (and corresponding reduction) of approximately $2.1 million in Revolving Loans (as defined therein), with the proceeds from the sale, assignment, or transfer of the Company's vested investment in Heart Aerospace Incorporated. • As a result of the repayment of the Effective Date Bridge Loan and pay down of the Revolving Loans, the shares of capital stock of Archer Aviation, Inc. held by the Company are being released as collateral for the United credit facility, subject to certain conditions. • The waiver of certain financial covenant defaults with respect to the fiscal quarters ended June 30, 2023, September 30, 2023, and December 31, 2023 and the waiver of projected financial covenant defaults with respect to the fiscal quarter ending March 31, 2024. • An increase in the Applicable Margin (as defined in the United credit facility) during a specified period of time for borrowings under the Credit Agreement. • Loan prepayment requirements in connection with the sale of four specified aircraft engines and the addition of such engines as collateral for the United credit facility for a specified period of time. American Purchase Agreement Subsequent to September 30, 2023, we closed the sale of the four remaining CRJ-900 aircraft to American for gross proceeds of $41.5 million. Net proceeds from the sale of all four aircraft was $5.7 million after the retirement of the EDC Loan and the MHIRJ junior noteholder debt. As part of our letter amendment entered into with MHIRJ in November 2022, approximately $5.0 million in principal was forgiven upon the repayment of $4.2 million in principal before December 31, 2023. Aircraft Purchase Agreement Subsequent to September 30, 2023, we closed the sale of the remaining four CRJ-900 aircraft as part of an aircraft purchase agreement to a third party for gross proceeds of $12.0 million. Net proceeds from the sale of all four aircraft was $6.5 million after partial debt reduction of our UST Loan. Engine Purchase Agreement On December 1, 2023, we entered into an agreement with a third party to sell 12 surplus GE model CF34-8C aircraft engines and related parts. The gross proceeds of $56.0 million will be used to retire approximately $40.0 million in associated debt and provide additional liquidity to fund operations and current debt obligations as they come due. The transaction is expected to close by the end of March 2024. Engine Purchase Commitment Subsequent to September 30, 2023, we entered into a purchase agreement with a third party which provides for the sale of 23 engines for gross proceeds of $11.5 million which will be used to pay down our UST Loan. The transaction is expected to close by the end of December 2024. Airframe and Engine Purchase Commitments We have 15 aircraft under the RASPRO finance lease with a buyout obligation of $50.3 million at the end of March 2024. Subsequent to September 30, 2023, we entered into purchase agreements with two separate parties to purchase the RASPRO aircraft and related engines. One agreement is for 30 engines for a total of $19.5 million. The second agreement is for 15 airframes (without engines) for a total of $18.8 million. Both of these transactions are expected to be completed by the end of March 2024, with net cash from these transactions expected to be approximately $(12.1) million.

On January 11, 2024 and January 19, 2024, we entered into the First Amendment to our Third Amended and Restated United CPA and the Second Amendment to our Third Amended and Restated United CPA (the "January 2024 United CPA Amendments"), respectively. The January 2024 United CPA Amendments provide additional liquidity and certain other amendments described below

•

Increased CPA rates, retroactive to October 1, 2023 through December 31, 2024, which are projected to generate approximately $63.5 million in incremental revenue over the next twelve months.

•

Amended certain notice requirements for removal by United of up to eight CRJ-900 Covered Aircraft (as defined in the United CPA) from the United CPA.

•

Extended United's existing utilization waiver for the Company's operation of E-175 and CRJ-900 Covered Aircraft (as defined in the United CPA) to June 30, 2024.

On January 11, 2024 and January 19, 2024, we entered into Amendment No. 4 to our Second Amended and Restated Credit and Guaranty Agreement, Amendment No. 1 to Stock Pledge Agreement and Limited Waiver of Conditions to Credit Extension ("Amendment No. 4") and Waiver and Amendment No. 5 to our Second Amended and Restated Credit and Guaranty Agreement (collectively, the "January 2024 Credit Agreement Amendments"), respectively. The January 2024 Credit Agreement Amendments provide for the following:

•

The repayment in full of the Company's $10.5 million Effective Date Bridge Loan obligations, and the prepayment (and corresponding reduction) of approximately $2.1 million in Revolving Loans (as defined therein), with the proceeds from the sale, assignment, or transfer of the Company's vested investment in Heart Aerospace Incorporated.

•

As a result of the repayment of the Effective Date Bridge Loan and pay down of the Revolving Loans, the shares of capital stock of Archer Aviation, Inc. held by the Company are being released as collateral for the United credit facility, subject to certain conditions.

•

The waiver of certain financial covenant defaults with respect to the fiscal quarters ended June 30, 2023, September 30, 2023, and December 31, 2023 and the waiver of projected financial covenant defaults with respect to the fiscal quarter ending March 31, 2024.

•

An increase in the Applicable Margin (as defined in the United credit facility) during a specified period of time for borrowings under the Credit Agreement.

•

Loan prepayment requirements in connection with the sale of four specified aircraft engines and the addition of such engines as collateral for the United credit facility for a specified period of time.

Subsequent to September 30, 2023, we closed the sale of the four remaining CRJ-900 aircraft to American for gross proceeds of $41.5 million. Net proceeds from the sale of all four aircraft was $5.7 million after the retirement of the EDC Loan and the MHIRJ junior noteholder debt. As part of our letter amendment entered into with MHIRJ in November 2022, approximately $5.0 million in principal was forgiven upon the repayment of $4.2 million in principal before December 31, 2023.

Subsequent to September 30, 2023, we closed the sale of the remaining four CRJ-900 aircraft as part of an aircraft purchase agreement to a third party for gross proceeds of $12.0 million. Net proceeds from the sale of all four aircraft was $6.5 million after partial debt reduction of our UST Loan.

On December 1, 2023, we entered into an agreement with a third party to sell 12 surplus GE model CF34-8C aircraft engines and related parts. The gross proceeds of $56.0 million will be used to retire approximately $40.0 million in associated debt and provide additional liquidity to fund operations and current debt obligations as they come due. The transaction is expected to close by the end of March 2024.

Subsequent to September 30, 2023, we entered into a purchase agreement with a third party which provides for the sale of 23 engines for gross proceeds of $11.5 million which will be used to pay down our UST Loan. The transaction is expected to close by the end of December 2024.

We have 15 aircraft under the RASPRO finance lease with a buyout obligation of $50.3 million at the end of March 2024. Subsequent to September 30, 2023, we entered into purchase agreements with two separate parties to purchase the RASPRO aircraft and related engines. One agreement is for 30 engines for a total of $19.5 million. The second agreement is for 15 airframes (without engines) for a total of $18.8 million. Both of these transactions are expected to be completed by the end of March 2024, with net cash from these transactions expected to be approximately $(12.1) million.