MESA AIR GROUP INC - Quarter Report: 2022 June (Form 10-Q)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark One)

For the quarterly period ended June 30, 2022

Or

FOR THE TRANSITION PERIOD FROM                      TO                     

Commission File Number 001-38626

MESA AIR GROUP, INC.

(Exact name of registrant as specified in its charter)

Registrant's telephone number, including area code: (602) 685-4000

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☒

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes  ☐    No  ☒

As of August 3, 2022, the registrant had 36,295,201 shares of common stock, no par value per share, issued and outstanding.

TABLE OF CONTENTS

Cautionary Note Regarding Forward-Looking Statements

This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). All statements other than statements of historical fact contained in this Quarterly Report on Form 10-Q, including statements regarding our future results of operations and financial position, business strategy and plans, and objectives of management for future operations, are forward-looking statements. These statements involve known and unknown risks, uncertainties, and other important factors that may cause our actual results, performance, or achievements to be materially different from any future results, performance, or achievements expressed or implied by the forward-looking statements.

Forward-looking statements provide current expectations of future events based on certain assumptions and include any statement that does not directly relate to any historical or current fact. Forward-looking statements can also be identified by words such as "future," "anticipates," "believes," "estimates," "expects," "intends," "plans," "predicts," "will," "would," “should,” "could," "can," "may," and similar terms. Forward-looking statements are not guarantees of future performance and our actual results may differ significantly from the results discussed in the forward-looking statements. Factors that might cause such differences include, but are not limited to, those discussed in Item 1A. Risk Factors of our Annual Report on Form 10-K for the fiscal year ended September 30, 2021 filed with the Securities and Exchange Commission on December 10, 2021. Unless otherwise stated, references to particular years, quarters, months, or periods refer to our fiscal years ended September 30 and the associated quarters, months, and periods of those fiscal years. Each of the terms "the Company," "Mesa Airlines," "Mesa," "we," "us" and "our" as used herein refers collectively to Mesa Air Group, Inc. and its wholly owned subsidiaries, unless otherwise stated. We do not assume any obligation to revise or update any forward-looking statements.

The events and circumstances reflected in our forward-looking statements may not be achieved or occur and actual results could differ materially from those projected in the forward-looking statements. Some of the key factors that could cause actual results to differ from our expectations include:

Additionally, the risks, uncertainties and other factors set forth above or otherwise referred to in the reports we have filed with the SEC may be further amplified by the global impact of the COVID-19 pandemic.  While we may elect to update these forward-looking statements at some point in the future, whether as a result of any new information, future events, or otherwise, we have no current intention of doing so except to the extent required by applicable law.

1

Part I – Financial Information

Item 1. Financial Statements

MESA AIR GROUP, INC.

Condensed Consolidated Balance Sheets

(In thousands, except share amounts) (Unaudited)

See accompanying notes to these condensed consolidated financial statements.

2

MESA AIR GROUP, INC.

Condensed Consolidated Statements of Operations and Comprehensive Income (Loss)

(In thousands, except per share amounts) (Unaudited)

See accompanying notes to these condensed consolidated financial statements.

3

MESA AIR GROUP, INC.

Condensed Consolidated Statements of Stockholders' Equity

(In thousands, except share amounts) (Unaudited)

4

MESA AIR GROUP, INC.

Condensed Consolidated Statements of Stockholders' Equity

(In thousands, except share amounts) (Unaudited)

See accompanying notes to these condensed consolidated financial statements.

5

MESA AIR GROUP, INC.

Condensed Consolidated Statements of Cash Flows

(In thousands) (Unaudited)

See accompanying notes to these condensed consolidated financial statements.

6

MESA AIR GROUP, INC.

Notes to Condensed Consolidated Financial Statements

(Unaudited)

About Mesa Air Group, Inc.

Headquartered in Phoenix, Arizona, Mesa Air Group, Inc. ("Mesa" or the "Company") is the holding company of Mesa Airlines, Inc. ("Mesa Airlines"), a regional air carrier providing scheduled flight service to 121 cities in 41 states, the District of Columbia, the Bahamas, and Mexico as well as cargo flight services out of Cincinnati/Northern Kentucky International Airport. As of June 30, 2022, Mesa’s fleet consisted of 168 aircraft which were operated under the Company’s Capacity Purchase Agreements (“CPAs”) and Flight Services Agreement (“FSA”), leased to a third party, held for sale or maintained as operational spares, with approximately 360 daily departures and 2,600 employees. Mesa operates all of its flights as either American Eagle, United Express, or DHL Express flights pursuant to the terms of CPAs entered into with American Airlines, Inc. (“American”) and United Airlines, Inc. (“United”) and FSA with DHL Network Operations (USA), Inc. (“DHL”) (each, our “major partner”).

The CPAs between us and our major partners involve a revenue-guarantee arrangement whereby the major partners pay fixed-fees for each aircraft under contract, departure, flight hour (measured from takeoff to landing, excluding taxi time) or block hour (measured from takeoff to landing, including taxi time), and reimbursement of certain direct operating expenses in exchange for providing flight services. The major partners also pay certain expenses directly to suppliers, such as fuel, ground operations and landing fees. Under the terms of these CPAs, the major partners control route selection, pricing, and seat inventories, reducing our exposure to fluctuations in passenger traffic, fare levels, and fuel prices. Under our FSA with DHL, we receive a fee per block hour with a minimum block hour guarantee in exchange for providing cargo flight services. Ground support expenses including fueling and airport fees are paid directly by DHL.

Impact of Pilot Shortage

         The length and severity of the pilot shortage, which has impacted the US passenger and cargo carriers, remains uncertain. One of the primary factors contributing to the pilot shortage is the demand for pilots at major carriers, which are hiring at an accelerated rate to backfill the thousands of pilots whom they offered early retirements to at the beginning of the pandemic. These airlines now seek to increase their capacity to meet the growing demand for air travel as the global pandemic has moderated. A primary source of pilots for the major US passenger and cargo carriers are the US regional airlines.

       While there is strong demand for air travel now in the United States, the exact timing and pace of a full recovery in demand remains uncertain given the significant impact of the pandemic on the overall U.S. and global economy. Air travel demand may continue to fluctuate as a result of the pandemic either moderating or becoming more extreme.  

       Our forecasted expenses and liquidity measures may be modified as we clarify the pilot shortage recovery timing and its impact upon our block hour production. The variable revenue based on the number of block hours has been significantly impacted by pilot attrition and our corresponding shortage of trained pilots. We may experience further reductions in subsequent quarters.  

       As a result of the pilot shortage, elevated pilot attrition and its negative impact on our financial results, we have taken, and are continuing to take, certain actions to increase liquidity and strengthen our financial position which include:

7

While there is no guarantee that these initiatives will come to fruition or otherwise achieve their desired objective, we believe it is probable that the initiatives outlined above, along with the cash flow from operating activities and cash on hand will provide us with adequate cash resources to maintain our operations and comply with our various debt and other contractual agreements, through at least the next 12 months.

As of June 30, 2022, the Company has $112.8 million of principal maturity payments on long-term debt due within the next twelve months.  We plan to meet these obligations with our cash on hand, ongoing cashflows from our operations, as well as the liquidity created from our plans to monetize 18 CRJ-700 aircraft, refinance our revolving credit facility, and further amend our CPAs. If our plans are not realized, this will necessitate exploring additional opportunities to create liquidity by refinancing and deferring repayment of our principal maturity payments that are due within the next twelve months. The Company continues to monitor covenant compliance with its lenders as any noncompliance could have a material impact on the Company’s financial position, cash flows and results of operations. See Sources and Uses of Cash in our Management’s Discussion and Analysis of Financial Condition and Results of Operations section for additional disclosure.

American Capacity Purchase Agreement

As of June 30, 2022, we operated 40 CRJ-900 aircraft under an Amended and Restated Capacity Purchase Agreement with American dated November 19, 2020 (as amended, the “American CPA”). In exchange for providing passenger flight services, we receive a fixed monthly minimum amount per aircraft under contract plus certain additional amounts based upon the number of flights and block hours flown during each month. In addition, we may also receive incentives or incur penalties based upon our operational performance, including controllable on-time departure (“CD0”) and controllable flight completion (“CCF”) percentages. American also reimburses us for certain costs on an actual basis, including passenger liability and hull insurance and aircraft property taxes. Other expenses, including fuel and certain landing fees, are directly paid to suppliers by American. In addition, American also provides, at no cost to us, certain ground handling and customer service functions as well as airport-related facilities and gates at American hubs and cities where we operate. The American CPA expires on December 31, 2025.

Our American CPA is subject to termination prior to its expiration in various circumstances including:

8

Under the American CPA, American had the option in its sole discretion to withdraw up to: (i) ten (10) aircraft during calendar year 2021, (ii) five (5) aircraft during each of calendar years 2022 and 2023, and (iii) during the period from January 1, 2024 to July 31, 2024, American can remove the first 20 aircraft to the extent not otherwise removed in 2021 – 2023, and thereafter American has the right to remove the remaining 20 aircraft. American also has the right and option to withdraw a specified number of aircraft upon each occurrence of the following:

On June 10, 2022, we amended our American CPA, pursuant to Amendment No. 8 thereto, to modify certain commercial terms thereunder. On June 20, 2022, we amended our American CPA, pursuant to Amendment No. 9 thereto, which amended and restated Schedule 1 (Covered Aircraft) to the American CPA and set forth certain equipment modification requirements with respect to Covered Aircraft added to such Schedule.

For the months of May and June 2022, we did not meet the CCF or CD0 minimum performance levels under the American CPA. The failure to meet the CCF or CD0 minimum performance levels for two (2) consecutive months under the terms of the American CPA gives American the right to remove two (2) additional aircraft from the CPA, one (1) aircraft for not meeting the CCF minimum performance level for two (2) consecutive months and one (1) aircraft for not meeting the CD0 minimum performance level for two (2) consecutive months. The Company's failure to meet the CCF or CD0 minimum performance levels for three (3) consecutive months gives American the right to terminate the CPA upon 90 days' notice and to provide a wind-down schedule. Subsequent to June 30, 2022, we entered into Amendment No. 10 to our American CPA which, among other things, reset the CCF and CD0 3-month measurement periods for purposes of American's termination rights to commence August 2022. See Note 17 - Subsequent Events for a discussion of Amendment No. 10. In addition to the foregoing, our block hour utilization has fallen below required levels in prior months, which also gives American the right to withdraw certain aircraft, subject to complying with applicable notice requirements under the American CPA.  As of the date of this Quarterly Report on Form 10-Q, American has not exercised such withdrawal rights.

United Capacity Purchase Agreement

As of June 30, 2022, we operated 60 E-175 and 20 E-175LL aircraft under a Second Amended and Restated Capacity Purchase Agreement with United dated November 4, 2020 (as amended, the “United CPA”). In exchange for providing passenger flight services, we receive a fixed monthly minimum amount per aircraft under contract plus certain additional amounts based upon the number of flights and block hours flown and the results of passenger satisfaction surveys. United reimburses us for certain costs on an actual basis, including property tax per aircraft and passenger liability insurance. United also reimburses us on a pass-through basis for all costs related to heavy airframe and engine maintenance, landing gear, auxiliary power units ("APUs"), and component maintenance for the E-175 aircraft owned by United. Other expenses, including fuel and certain landing fees, are directly paid to suppliers by United.

Under our United CPA, United owns 42 of the 60 E-175 aircraft and all of the E-175LL aircraft and leases them to us at nominal amounts. The E-175 aircraft owned by United and leased to us have terms expiring between 2024 and 2028, and the 18 E-175 aircraft owned by us have terms expiring in 2028. The E-175LL aircraft have terms expiring between 2032 and 2033.

Pursuant to the United CPA, we agreed to lease our CRJ-700 aircraft to another United Express service provider for a term of nine (9) years. We ceased operating our CRJ-700 fleet in February 2021 in connection with the transfer of those aircraft into a lease agreement, and as of June 30, 2022, have entered into agreements to lease 20 of our 20 CRJ-700 aircraft.

Our United CPA is subject to termination rights prior to its expiration in various circumstances including:

9

DHL Flight Services Agreement

On December 20, 2019, we entered into a Flight Services Agreement with DHL (the “DHL FSA”). Under the terms of the DHL FSA, we operate three (3) Boeing 737-400F aircraft to provide cargo air transportation services. In exchange for providing cargo flight services, we receive a fee per block hour with a minimum block hour guarantee. We are eligible for a monthly performance bonus or subject to a monthly penalty based on timeliness and completion performance. Ground support expenses including fueling and airport fees are paid directly by DHL.

Under our DHL FSA, DHL leases two (2) Boeing 737-400F aircraft and subleases them to us at nominal amounts. DHL reimburses us on a pass-through basis for all costs related to heavy maintenance including C-checks, off-wing engine maintenance and overhauls including life limited parts (“LLPs”), landing gear overhauls and LLPs, thrust reverser overhauls, and APU overhauls and LLPs. Certain items such as fuel, de-icing fluids, landing fees, aircraft ground handling fees, en-route navigation fees, and custom fees are paid directly to suppliers by DHL or otherwise reimbursed if incurred by us.

Our DHL FSA expires five (5) years from the commencement date of the first aircraft placed into service, which was in October 2020. DHL has the option to extend the agreement with respect to one or more aircraft for a period of one year with 90 days’ advance written notice.

Our DHL FSA is subject to termination rights prior to its expiration in various circumstances including:

For the months of April, May, and June 2022, we did not meet the CCF and CA minimum performance levels under the DHL FSA. The failure to meet the minimum performance levels for three (3) consecutive months under the terms of the DHL FSA gives DHL the right to terminate the FSA. Management has received a waiver arising out of the failure to meet the aforementioned CCF and CA performance levels.

10

Basis of Presentation

The accompanying condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("GAAP") and include the accounts of the Company and its wholly owned operating subsidiaries. Any reference in these notes to applicable guidance is meant to refer to the authoritative GAAP as found in the Accounting Standards Codification ("ASC") and Accounting Standards Update ("ASU") of the Financial Accounting Standards Board ("FASB"). All intercompany accounts and transactions have been eliminated in consolidation. Reclassifications of certain immaterial prior period amounts have been made to conform to the current period presentation.

These condensed consolidated financial statements should be read in conjunction with the Company's audited consolidated financial statements and notes thereto as of and for the year ended September 30, 2021 included in the Company's Annual Report on Form 10-K for the year ended September 30, 2021 on file with the U.S. Securities and Exchange Commission (the "SEC"). Information and footnote disclosures normally included in financial statements have been condensed or omitted in these condensed consolidated financial statements pursuant to the rules and regulations of the SEC and GAAP. These condensed consolidated financial statements reflect all adjustments that, in the opinion of management, are necessary to present fairly the results of operations for the interim periods presented.

The Company is an "emerging growth company," as defined in the Jumpstart Our Business Startups Act of 2012 (the "JOBS Act") and may remain an emerging growth company until the last day of its fiscal year following the fifth anniversary of the Company’s initial public offering (“IPO”), subject to specified conditions. The JOBS Act provides that an emerging growth company can take advantage of the extended transition period afforded by the JOBS Act for the implementation of new or revised accounting standards. The Company has elected to "opt out" of such extended transition period, which means that when a standard is issued or revised and it has different application dates for public or private companies, the Company will be subject to the same new or revised accounting standards as other public companies that are not emerging growth companies.

Segment Reporting

As of June 30, 2022, our chief operating decision maker was the Chief Executive Officer. While we operate under two separate capacity purchase agreements and a flight services agreement, we do not manage our business based on any performance measure at the individual contract level. Our chief operating decision maker uses consolidated financial information to evaluate our performance and allocate resources, which is the same basis on which he communicates our results and performance to our Board of Directors. Accordingly, we have a single operating and reportable segment.

Use of Estimates

The preparation of the Company's condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, and expenses and the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements. Actual results could differ from those estimates.

Contract Revenue and Pass-through and Other Revenue

We recognize contract revenue when the service is provided under our CPAs and FSA. Under the CPAs and FSA, our major partners generally pay for each departure, flight hour or block hour incurred, and an amount per aircraft in service each month with additional incentives or penalties based on flight completion, on-time performance, and other operating metrics. Our performance obligation is met as each flight is completed, and revenue is recognized and reflected in contract revenue.

We recognize pass-through revenue when the service is provided under our CPAs and FSA. Pass-through revenue represents reimbursements for certain direct expenses incurred including passenger liability and hull insurance, property taxes, other direct costs defined within the agreements, and major maintenance on aircraft leased from our major partners at nominal rates. Our performance obligation is met when each flight is completed or as the maintenance services are performed, and revenue is recognized and reflected in pass-through and other revenue.

11

We record deferred revenue when cash payments are received or are due from our major partners in advance of our performance. During the three and nine months ended June 30, 2022, we recognized $6.8 million and $11.8 million of previously deferred revenue, respectively. Deferred revenue is recognized as flights are completed over the remaining terms of the respective contracts.

The deferred revenue balance as of June 30, 2022 represents our aggregate remaining performance obligations that will be recognized as revenue over the period in which the performance obligations are satisfied, and is expected to be recognized as revenue as follows (in thousands):

A portion of our compensation under our CPAs with American and United is designed to reimburse the Company for certain aircraft ownership costs. Such costs include aircraft principal and interest debt service costs, aircraft depreciation, and interest expense or aircraft lease expense costs while the aircraft is under contract. We have concluded this component of the compensation under these agreements is lease revenue, as such agreements identify the "right of use" of a specific type and number of aircraft over a stated period of time. We account for the non-lease component under ASC 606 and account for the lease component under ASC 842. We allocate the consideration in the contract between the lease and non-lease components based on their stated contract prices, which is based on a cost basis approach representing our estimate of the stand-alone selling prices.

The lease revenue associated with our CPAs is accounted for as an operating lease and is reflected as contract revenue in the condensed consolidated statements of operations and comprehensive income (loss). We recognized $38.7 million and $41.2 million of lease revenue for the three months ended June 30, 2022 and 2021, respectively, and $118.5 million and $131.8 million during the nine months ended June 30, 2022 and 2021, respectively. We have not separately stated aircraft rental income in the condensed consolidated statements of operations and comprehensive income (loss) because the use of the aircraft is not a separate activity from the total service provided under our CPAs.    

We have entered into lease agreements with GoJet Airlines LLC (“GoJet”) to lease 20 CRJ-700 aircraft as of June 30, 2022. The lease agreements are accounted for as operating leases and have a term of nine (9) years beginning on the delivery date of each aircraft. Under the lease agreements, GoJet pays fixed monthly rent per aircraft and variable lease payments for supplemental rent based on monthly aircraft utilization at fixed rates. Supplemental rent payments are subject to reimbursement following GoJet’s completion of qualifying maintenance events defined in the agreements. Lease revenue for fixed monthly rent payments is recognized ratably within contract revenue. Lease revenue for supplemental rent is deferred and recognized within contract revenue when it is probable that amounts received will not be reimbursed for future qualifying maintenance events over the lease term.

We mitigate the residual asset risks through supplemental rent payments and by leasing aircraft and engine types that we can operate in the event of a default. Additionally, the leases have specified lease return condition requirements and we maintain inspection rights under the leases. As of June 30, 2022, we recognized $15.0 million of lease incentive assets, net of amortization, and $11.6 million of related lease incentive obligations for reimbursement of certain aircraft maintenance costs defined within the lease agreements. Lease incentive assets are amortized on a straight-line basis and recognized as a reduction to lease revenue over the lease term.

Lease revenue recognized under the GoJet agreements, net of amortization of the lease incentive assets, was $7.1 million and $20.3 million for the three and nine months ended June 30, 2022, respectively, and $3.4 million and $4.0 million for the three and nine months ended June 30, 2021, respectively. Amounts deferred for supplemental rent payments totaled $2.6 million as of June 30, 2022.

12

The following table summarizes future minimum rental income under operating leases related to leased aircraft that had remaining non-cancelable lease terms as of June 30, 2022 (in thousands):

Leases

We determine if an arrangement is a lease at inception. As a lessee, we have lease agreements with lease and non-lease components and have elected to account for such components as a single lease component. Our operating lease activities are recorded in operating lease right-of-use assets, current maturities of operating leases, and noncurrent operating lease liabilities in the condensed consolidated balance sheets. Finance leases are reflected in property and equipment, net, current portion of long-term debt and finance leases, and long-term debt and finance leases, excluding current portion in the condensed consolidated balance sheets.

Right-of-use (“ROU”) assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and lease liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. Certain variable lease payments are not included in the calculation of the right-of-use assets and lease liability due to uncertainty of the payment amount and are recorded as lease expense in the period incurred. In determining the present value of lease payments, we use either the implicit rate in the lease when it is readily determinable or our estimated incremental borrowing rate, based on information available at the lease commencement. Our lease terms include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Operating lease costs are recognized on a straight-line basis over the lease term, while finance leases result in a front-loaded expense pattern.

As a lessee, we have elected a short-term lease practical expedient on all classes of underlying assets, permitting us to not apply the recognition requirements of ASC 842 to leases with terms of 12 months or less.

We lease, at nominal rates, certain aircraft from United and DHL under our United CPA and DHL FSA, which are excluded from operating lease assets and liabilities as they do not represent embedded leases under ASC 842. Other than such leases at nominal amounts, approximately 11% of our aircraft are leased from third parties. All of our aircraft leases have been classified as operating leases, which results in rental payments being charged to expense over the term of the related leases. In the event that we or one of our major partners decide to exit an activity involving leased aircraft, losses may be incurred. In the event that we exit an activity that results in exit losses, these losses are accrued as each aircraft is removed from operations for early termination penalties, lease settle up and other charges. Additionally, any remaining ROU assets and lease liabilities are written off.

The majority of our leased aircraft are leased through trusts that have a sole purpose to purchase, finance, and lease these aircraft to us; therefore, they meet the criteria of a variable interest entity. However, since these are single-owner trusts in which we do not participate, we are not at risk for losses and are not considered the primary beneficiary. Management believes that our maximum exposure under these leases is the remaining lease payments.

Contract Liabilities

Contract liabilities consist of deferred credits for cost reimbursements from major partners related to aircraft modifications and pilot training associated with capacity purchase agreements. The deferred credits are recognized over time depicting the pattern of the transfer of control of services resulting in ratable recognition of revenue over the remaining term of the capacity purchase agreements.

Current and non-current deferred credits are recorded in other accrued expenses and non-current deferred credits in the condensed consolidated balance sheets. Our total current and non-current deferred credit balances at June 30, 2022 and September 30, 2021 were $4.1 million and $4.8 million, respectively. We recognized $0.2 million and $0.2 million of the

13

deferred credits within contract revenue during the three months ended June 30, 2022 and 2021, respectively, and $0.6 million and $2.1 million during the nine months ended June 30, 2022 and 2021, respectively.

Maintenance Expense

We operate under an FAA approved continuous inspection and maintenance program. The cost of non-major scheduled inspections and repairs and routine maintenance costs for all aircraft and engines are charged to maintenance expense as incurred.

We account for heavy maintenance and major overhaul costs on our owned E-175 fleet under the deferral method whereby the cost of heavy maintenance and major overhaul is deferred and amortized until the earlier of the end of the useful life of the related asset or the next scheduled heavy maintenance event. Amortization of heavy maintenance and major overhaul costs charged to depreciation and amortization expense was $0.5 million and $0.1 million for the three months ended June 30, 2022 and 2021, respectively, and $1.2 million and $0.1 million for the nine months ended June 30, 2022 and 2021, respectively. As of June 30, 2022 and September 30, 2021, our deferred heavy maintenance balance, net of accumulated amortization, was $6.8 million and $3.5 million, respectively.

We account for heavy maintenance and major overhaul costs for all other fleets under the direct expense method whereby costs are expensed to maintenance expense as incurred, except for certain maintenance contracts where labor and materials price risks have been transferred to the service provider and require payment on a utilization basis, such as flight hours. Costs incurred for maintenance and repair for utilization maintenance contracts where labor and materials price risks have been transferred to the service provider are charged to maintenance expense based on contractual payment terms.

Engine overhaul expense totaled $8.1 million and $4.0 million for the three months ended June 30, 2022 and 2021, respectively, of which $6.0 million and $2.7 million, respectively, was pass-through expense. Engine overhaul expense totaled $18.2 million and $25.3 million for the nine months ended June 30, 2022 and 2021, respectively, of which $14.5 million and $14.5 million, respectively, was pass-through expense. Airframe C-check expense totaled $5.0 million and $14.1 million for the three months ended June 30, 2022 and 2021, respectively, of which $1.3 million and $5.6 million, respectively, was pass-through expense. Airframe C-check expense totaled $18.8 million and $38.3 million for the nine months ended June 30, 2022 and 2021, respectively, of which $1.7 million and $18.3 million, respectively, was pass-through expense.

Assets Held for Sale

We classify assets as held for sale when our management approves and commits to a formal plan of sale that is probable of being completed within one year. Assets designated as held for sale are recorded at the lower of their current carrying value or their fair market value, less costs to sell, beginning in the period in which the assets meet the criteria to be classified as held for sale. See Note 6 for further discussion of our assets classified as held for sale as of June 30, 2022.

In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU 2019-12”) to simplify the accounting for income taxes by eliminating certain exceptions allowable under the existing guidance related to the approach for intraperiod tax allocations, the methodology for calculating income taxes in an interim period, and the recognition of deferred tax liabilities for outside basis differences. Our adoption of this guidance on October 1, 2021 did not have a material impact.

In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848) (“ASU 2020-04”). This ASU provides optional expedients and exceptions for a limited period of time for accounting for contracts, hedging relationships, and other transactions affected by the London Interbank Offered Rate (LIBOR) or another reference rate expected to be discontinued. Optional expedients can be applied through December 31, 2022. We continue to evaluate our contracts that reference LIBOR.

Financial instruments that potentially expose the Company to a concentration of credit risk consist principally of cash and cash equivalents that are primarily held by financial institutions in the United States and accounts receivable. Amounts on deposit with a financial institution may at times exceed federally insured limits. We maintain our cash accounts with high credit quality financial institutions and, accordingly, minimal credit risk exists with respect to the financial institutions.

14

As of June 30, 2022, we had $3.3 million in restricted cash. We have an agreement with a financial institution for a letter of credit facility and to issue letters of credit for particular airport authorities, worker's compensation insurance, property and casualty insurance and other business needs as required in certain lease agreements. Pursuant to the terms of this agreement, $3.3 million of outstanding letters of credit are required to be collateralized by amounts on deposit.

Significant customers are those which represent more than 10% of our total revenue or net accounts receivable balance at each respective balance sheet date. All of our revenue for the three and nine months ended June 30, 2022 and 2021 was derived from the American and United CPAs, DHL FSA, and from leases of our CRJ-700 aircraft to GoJet. Substantially all of our accounts receivable at June 30, 2022 and September 30, 2021 was derived from these agreements.

American accounted for approximately 46% and 45% of our total revenue for the three months ended June 30, 2022 and 2021, respectively, and 46% and 46% of our total revenue for the nine months ended June 30, 2022 and 2021, respectively. United accounted for approximately 47% and 51% of our total revenue for the three months ended June 30, 2022 and 2021, respectively, and 48% and 52% of our total revenue for the nine months ended June 30, 2022 and 2021, respectively. A termination of either the American or United CPA would have a material adverse effect on our business prospects, financial condition, results of operations, and cash flows.

Amounts billed under our agreements are subject to our interpretation of the applicable agreement and are subject to audit by our major partners. Periodically, our major partners dispute amounts billed and pay amounts less than the amount billed. Ultimate collection of the remaining amounts not only depends upon the Company prevailing under the applicable audit, but also upon the financial well-being of the major partner. As such, we review amounts due based on historical collection trends, the financial condition of the major partners, and current external market factors and record a reserve for amounts estimated to be uncollectible in accordance with the applicable guidance for expected credit losses. Our allowance for doubtful accounts was not material as of June 30, 2022 or September 30, 2021. If our ability to collect these receivables and the financial viability of our major partners is materially different than estimated, our estimate of the allowance for credit losses could be materially impacted.

Information about our intangible assets as of June 30, 2022 and September 30, 2021, is as follows (in thousands):

Total amortization expense recognized was $0.3 million and $0.3 million for the three months ended June 30, 2022 and 2021, respectively, and $0.8 million and $0.9 million for the nine months ended June 30, 2022 and 2021, respectively. We expect to record amortization expense of $0.3 million for the remainder of 2022, and $0.9 million, $0.8 million, $0.7 million, and $0.6 million for fiscal years 2023, 2024, 2025 and 2026, respectively, and $2.8 million of amortization expense thereafter.

As of June 30, 2022, our intangible assets’ remaining amortization term is 13.3 years.

During 2022, our management committed to a formal plan to sell certain of our CRJ-900 and CRJ-200 aircraft. The aircraft are expected to be disposed of via sale within the next 12 months. Accordingly, we determined the aircraft met the criteria to be classified as assets held for sale and have separately presented them in our condensed consolidated balance sheet at the lower of their current carrying value or their fair market value less costs to sell. The fair values are based upon observable and unobservable inputs, including recent purchase offers and market trends and conditions. The assumptions used to determine the fair value of our assets held for sale are subject to inherent uncertainty and could produce a wide range of outcomes which we will continue to monitor in future periods as new information becomes available. Prior to the ultimate sale of the assets, subsequent changes in our estimate of the fair value of our assets held for sale will be recorded as a gain or loss with a corresponding adjustment to the assets’ carrying value. In connection with the classification of these assets as held for sale, we recorded impairment losses of $39.5 million, which are reflected within impairment of assets held for sale in our condensed consolidated statements of operations and comprehensive income (loss).  

15

Certain significant amounts included in the condensed consolidated balance sheets consisted of the following (in thousands):

We record impairment charges on long-lived assets used in operations when events and circumstances indicate that the assets may be impaired, the undiscounted net cash flows estimated to be generated by those assets are less than the carrying amount of those assets, and the net book value of the assets exceeds their estimated fair value. We have assessed whether any impairment of our long-lived assets held and used existed and have determined that no charges were deemed necessary under applicable accounting standards as of June 30, 2022. Our assumptions about future conditions relevant to the assessment of potential impairment of our long-lived assets held and used are subjects to uncertainty, and we will continue to monitor these conditions in future periods as new information becomes available, and will update our analyses accordingly.

Property and equipment, net:

Depreciation of property and equipment totaled $19.3 million and $20.6 million for the three months ended June 30, 2022 and 2021, respectively, and $59.9 million and $61.2 million for the nine months ended June 30, 2022 and 2021, respectively. 

16

Investments in Equity Securities

In connection with a negotiated forward purchase contract for electrically-powered vertical takeoff and landing aircraft (“eVTOL aircraft”) executed in February 2021, we obtained warrants giving us the right to acquire a number shares of common stock in Archer Aviation, Inc. (“Archer”). 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 measured in earnings, in accordance with ASC 321, Investments – Equity Securities. In connection with the closing of the merger between Archer and the SPAC, 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. All of our vested warrants have been exercised into shares of Archer common stock.

The initial grant date values of the warrants were 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.

Our investments in Archer are classified as Level 1 within the fair value hierarchy as the values are determined using quoted prices for the equity securities.

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.

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 do not have a readily determinable fair value, so we account for them using the measurement alternative under ASC 321 and measure 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 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 discount to fair value is warranted. Any changes in fair value from the grant date value of the warrant assets will be recognized as increases or decreases to the investment on our balance sheet and as net gains or losses on investments equity securities. 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.

Total net losses on our investments in equity securities totaled $3.9 million and $12.6 million during the three and nine months ended June 30, 2022, respectively, and are reflected in loss on investments, net in our condensed consolidated statements of operations and comprehensive income (loss). As of June 30, 2022, the aggregate carrying amount of our investments in equity securities was $16.0 million, and the carrying amount of our investments without readily determinable fair values was $9.6 million.

17

Fair value is an exit price representing the amount that would be received to sell an asset, or paid to transfer a liability, in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. Accounting standards include disclosure requirements relating to the fair values used for certain financial instruments and establish a fair value hierarchy. The hierarchy prioritizes valuation inputs into three levels based on the extent to which inputs used in measuring fair value are observable in the market. Each fair value measurement is reported in one of three levels:

Other than our assets held for sale and investments in equity securities described in Notes 6 and 7, respectively, we did not measure any of our assets or liabilities at fair value on a recurring or nonrecurring basis as of June 30, 2022 and September 30, 2021.

The carrying values reported in the condensed consolidated balance sheets for cash and cash equivalents, accounts receivable, and accounts payable approximate fair value because of the immediate or short-term maturity of these financial instruments.

Our debt agreements are not traded on an active market. We have determined the estimated fair value of our debt to be Level 3, as certain inputs used to determine the fair value of these agreements are unobservable and, therefore, could be sensitive to changes in inputs. We utilize the discounted cash flow method to estimate the fair value of Level 3 debt.

The carrying value and estimated fair value of our total long-term debt, including current maturities, were as follows (in millions):

18

Long-term debt as of June 30, 2022 and September 30, 2021, consisted of the following (in thousands):