AAR’s $4 Billion MRO Holdings Deal Is Really a Bet on Aircraft Scarcity

AAR Is Making a Company-Sized Acquisition

AAR has agreed to acquire a 65% controlling interest in MRO Holdings, one of the largest independent aircraft maintenance providers in the Americas, at an implied enterprise value of $4.0 billion.

The scale is unusual relative to AAR itself.

AAR entered the transaction with a public equity value of roughly $5.3 billion. MRO Holdings is expected to generate approximately $1.0 billion of calendar 2026 revenue and $285 million of adjusted EBITDA.

The initial 65% acquisition therefore represents a major expansion rather than a bolt-on transaction.

AAR will consolidate MRO Holdings after closing, so the transaction materially changes the size, margin profile and leverage of the combined company.

The Asset Being Acquired Is Much More Profitable Than AAR

The most immediate financial attraction is MRO Holdings' profitability.

MRO Holdings is expected to generate approximately $285 million of adjusted EBITDA on $1.0 billion of calendar 2026 sales, implying an adjusted EBITDA margin of roughly 27%.

AAR generated approximately $401 million of adjusted EBITDA on $3.3 billion of fiscal 2026 revenue, or an adjusted EBITDA margin of roughly 12.1%.

Combining the businesses on a simple pro forma basis produces approximately $4.3 billion of revenue and $686 million of adjusted EBITDA before synergies.

AAR says the transaction lifts its pro forma adjusted EBITDA margin to approximately 16% before synergies, roughly 400 basis points above its standalone fiscal 2026 level.

That is a major change in the company's earnings profile.

The 10.7x Headline Multiple Needs an Important Adjustment

AAR describes the transaction as occurring at approximately 10.7 times MRO Holdings' forecast calendar 2026 adjusted EBITDA.

That headline multiple includes $75 million of anticipated run-rate cost synergies and approximately $150 million of present-value tax benefits.

Using MRO Holdings' standalone $285 million of expected adjusted EBITDA without those adjustments produces a simple enterprise-value multiple of approximately 14.0 times.

Neither calculation is inherently wrong. They answer different questions.

The 14.0x figure reflects the price relative to the earnings MRO Holdings is expected to produce on a standalone basis. The 10.7x figure reflects AAR's expected economics after giving credit for cost savings and tax benefits.

Investors therefore need to believe that a meaningful portion of the planned synergies is achievable for the headline transaction multiple to become representative of the economics AAR ultimately realizes.

The Acquisition Is Ultimately a Bet on Aircraft Staying in Service Longer

The strategic case rests on a structural constraint in commercial aviation.

Airlines want more aircraft, but manufacturers have struggled to deliver enough new jets to satisfy demand. Supply-chain disruptions, engine availability and production constraints have extended replacement cycles across the industry.

When new aircraft arrive later, older aircraft remain in service longer.

Older aircraft require maintenance.

That creates demand for exactly the heavy airframe maintenance capacity AAR is acquiring.

AAR estimates the global commercial fleet could increase from approximately 29,000 aircraft in 2026 to roughly 42,000 by 2035, an increase of about 45%.

But fleet growth is only part of the opportunity. The existing fleet also has to remain operational while airlines wait for replacement aircraft.

Aircraft scarcity can therefore support MRO demand even before the global fleet reaches those future levels.

Heavy Maintenance Is Difficult to Scale Quickly

The supply side of aircraft maintenance is constrained as well.

MRO Holdings employs approximately 10,000 people and operates 115 lines of airframe maintenance capacity across facilities in the United States, Mexico, El Salvador and Colombia.

AAR currently performs approximately 7 million maintenance service hours annually. MRO Holdings contributes approximately 12 million.

The combined company would therefore perform around **19 million maintenance hours per year**.

AAR currently services approximately 1,200 aircraft annually. The combined organization expects to service nearly 3,000.

This capacity cannot be replicated simply by spending capital.

Heavy maintenance requires hangars, regulatory approvals, tooling, experienced technicians and large numbers of skilled mechanics. Labor availability has become one of the industry's persistent constraints.

That makes existing scaled MRO capacity strategically valuable.

Nearshoring May Be the Most Interesting Growth Opportunity

Approximately 90% of MRO Holdings' revenue comes from U.S. customers, even though much of its maintenance footprint is located in Latin America.

Facilities in El Salvador, Mexico and Colombia provide access to lower-cost labor while remaining geographically close to North American airline customers.

That creates a form of nearshoring for aircraft maintenance.

Aircraft can be moved to lower-cost maintenance facilities without the logistical complexity associated with sending them across the world.

AAR believes the enlarged network can also attract additional European and Middle Eastern fleets for maintenance in the Americas and expand into widebody work.

If successful, the opportunity extends beyond simply combining the two companies' existing customer bases.

Heavy Maintenance Is Also a Customer-Acquisition Channel

AAR's strategy is broader than collecting revenue from maintenance labor.

Management describes heavy maintenance as a foundational part of its Parts, Repair and Software platform.

When an aircraft enters a hangar, it requires replacement parts, component repair, engineering support and maintenance planning.

That gives AAR opportunities to sell services from other parts of the company into the same customer relationship.

The combined company expects to service nearly 3,000 aircraft annually, creating a much larger channel for AAR's OEM distribution relationships, component-repair operations and software products.

The strategic value of MRO Holdings therefore depends partly on whether AAR can convert maintenance relationships into broader aftermarket revenue.

The $75 Million Synergy Target Is Meaningful

AAR expects approximately $75 million of annual run-rate cost synergies within three to four years after closing.

Those savings are expected to come from operations optimization, procurement, SG&A efficiencies and shared operational practices.

Relative to MRO Holdings' expected $285 million of standalone adjusted EBITDA, $75 million represents approximately **26%**.

That is a meaningful assumption.

AAR is not merely expecting modest corporate overhead savings. The synergy target is large enough to materially affect the transaction multiple and the combined company's margin trajectory.

Management is targeting consolidated adjusted EBITDA margins of approximately **19% to 20% within three to four years**, compared with roughly 12% for standalone AAR in fiscal 2026.

The full run-rate synergy benefit is not expected until roughly fiscal 2030 based on the announced closing timetable.

The Balance Sheet Is the Main Trade-Off

AAR ended August 31 with approximately $780.5 million of net debt and net leverage of approximately 1.81 times.

The MRO Holdings transaction will materially increase that leverage.

AAR expects approximately $2.1 billion of new debt financing and projects net leverage of approximately **3.6 times at closing**, including anticipated run-rate synergies.

Management expects leverage to decline to approximately 3.0 times within two years and eventually return to its 2.0 to 2.5 times target range.

That deleveraging path is central to the investment case.

If integration proceeds as planned and MRO Holdings continues generating strong cash flow, the debt load should decline relatively quickly.

If margins weaken, synergies arrive more slowly or the aviation cycle softens, the higher leverage gives AAR less flexibility than it has today.

MRO Holdings’ Cash Generation Is Central to the Deleveraging Plan

The acquired business has an attractive cash-flow profile.

MRO Holdings converted approximately 70% of adjusted EBITDA into adjusted operating cash flow during calendar 2025.

Using the company's $285 million calendar 2026 EBITDA estimate simply as a scale reference, a similar conversion rate would imply roughly $200 million of annual operating cash generation before considering changes in earnings or working capital.

AAR also negotiated an unusual feature into the ownership structure.

During the first two years following closing, AAR will receive **100% of MRO Holdings' excess cash flow**, despite initially owning only 65% of the company.

That cash will support repayment of an intercompany loan and deleveraging.

The structure helps explain how management expects to reduce leverage relatively quickly despite the size of the transaction.

Existing AAR Shareholders Are Also Being Diluted

Debt is only one component of the financing.

AAR will issue approximately **$780 million of equity at $135 per share** to existing MRO Holdings shareholders.

Those sellers are expected to own approximately 12% of pro forma AAR.

A separate approximately $230 million PIPE financing will add another group of institutional shareholders and represent roughly 5% of the pro forma company.

AAR closed September 28 at approximately $115.09, making the $135 transaction share price roughly 17% above the unaffected closing price.

The premium reduces the number of shares AAR needs to issue for a given amount of consideration.

But existing shareholders are still accepting meaningful dilution in exchange for acquiring a substantially larger and higher-margin business.

The Sellers Are Keeping Exposure to the Combined Company

The transaction structure is also notable because MRO Holdings' existing owners are not fully exiting.

They will retain a 35% interest in MRO Holdings while also receiving AAR shares.

AAR can acquire another 5% of MRO Holdings at any time during the first six years after closing and has options to acquire the remaining 30% in three 10% tranches on the second, third and fourth anniversaries.

The future purchase price is linked to AAR's then-current last-twelve-month enterprise-value-to-adjusted-EBITDA multiple, subject to a 13.5x floor and 15.25x cap, with adjustments for tax benefits.

That structure leaves the sellers economically exposed to the performance of both MRO Holdings and AAR after the transaction.

It also means the ultimate cost of owning 100% of MRO Holdings has not yet been fixed.

AAR’s Existing Business Is Performing Well Before the Deal

AAR is not pursuing the acquisition from a position of operating weakness.

In its fiscal first-quarter 2027 results, the company reported revenue of approximately $918 million, up 24% year over year.

Adjusted EBITDA increased approximately 34% to $117 million, while adjusted EBITDA margin expanded to 12.7%.

Adjusted diluted EPS increased approximately 38% to $1.49.

Operating cash flow improved to $55.8 million from negative $44.9 million a year earlier.

Commercial-customer sales increased approximately 28%, while government sales grew 14%.

Parts Supply revenue increased approximately 31%, and Repair & Engineering revenue also increased approximately 31%.

Management raised its fiscal 2027 sales outlook to low-teens organic-style growth excluding Legacy Commercial Programs.

That Strength Also Raises the Execution Bar

Strong standalone results make the timing of the transaction easier to understand.

AAR is using a period of strong demand, improving margins and elevated equity value to acquire a business that can materially increase its scale.

But the same strength raises expectations.

Management expects the acquisition to be accretive to adjusted EPS by a high-single-digit percentage in the first full fiscal year after closing.

It also expects adjusted EBITDA margins to reach approximately 19% to 20% within three to four years.

Those targets require successful integration, realization of the $75 million synergy program, continued MRO demand and disciplined deleveraging.

The transaction is expected to close during AAR's fiscal third quarter ending February 2027, subject to regulatory approvals and customary conditions.

The Investor Takeaway

AAR's MRO Holdings transaction is much larger than a conventional capacity acquisition.

It is effectively a bet that commercial aircraft will remain scarce enough, old enough and heavily utilized enough to support structurally strong maintenance demand for years.

MRO Holdings brings approximately $1 billion of revenue, $285 million of adjusted EBITDA, 12 million annual maintenance hours and a network of facilities serving primarily U.S. airline customers.

For AAR, that would increase revenue by more than 30% on a simple standalone comparison and lift pro forma adjusted EBITDA margins from roughly 12% to approximately 16% before synergies.

The strategic logic is compelling because heavy-maintenance capacity is difficult to build quickly and can feed customers into AAR's higher-value parts, component-repair and software businesses.

But AAR is paying for that strategic position with leverage and dilution.

Net leverage is expected to rise from approximately 1.8 times to 3.6 times at closing, and the 10.7x transaction multiple depends partly on $75 million of future cost synergies and tax benefits. Existing shareholders will also be diluted through the equity issued to MRO Holdings owners and PIPE investors.

That makes execution more important than the headline growth rate.

If aircraft scarcity keeps older fleets flying, MRO Holdings maintains its cash generation and AAR successfully cross-sells its broader aftermarket platform, the transaction could materially change AAR's earnings profile.

If the aviation cycle weakens before the company deleverages, the same transaction would leave AAR carrying substantially more financial risk.

The core question is therefore not whether MRO demand is strong today. It is whether today's shortage of aircraft and maintenance capacity is durable enough to support the economics AAR is underwriting for the next several years.