AAR CORP. (NYSE: AIR) announced on September 28, 2026 that it had agreed to acquire a 65.0% controlling interest in MRO Holdings, a heavy airframe maintenance platform operating across the Americas, at an implied enterprise value of approximately $4.0Bn. The announcement accompanied AAR’s fiscal first quarter results for its 2027 financial year, and the company has stated that the combination would likely create the largest heavy maintenance MRO in the world. That claim appears defensible given a combined footprint of roughly 115 heavy maintenance lines and close to 3,000 aircraft serviced each year.

The structure of the transaction is at least as notable as its size. AAR is acquiring control now while retaining options over the remaining 35.0%, which likely allows it to consolidate a large asset without funding the full equity position at a single point in the cycle. That approach appears well suited to a sector in which capacity is scarce, valuations are firm and the cost of capital sits above the level of the past decade.

Transaction Overview

The $4.0Bn figure is the implied enterprise value of MRO Holdings as a whole, and it equates to approximately 10.7x the target’s forecast full calendar year 2026 adjusted EBITDA. The consideration AAR is committing at closing is a different number: the 65.0% interest carries an equity value of approximately $1.8Bn. Both figures come from the same disclosure, and using them interchangeably would misstate the commitment. AAR holds options over the balance, with 5.0% exercisable at any time within six years of closing and the remaining 30.0% in three equal 10.0% tranches on the second, third and fourth anniversaries.

Funding appears to combine approximately $2.1Bn of new debt, roughly $780.0MM of equity issued to existing MRO Holdings shareholders at $135.00 per share and a $230.0MM PIPE led by The Pritzker Organization. AAR also expects to repay approximately $1.3Bn of MRO Holdings’ existing debt. Net leverage at closing is guided to approximately 3.6x including run-rate synergies, with management targeting roughly 3.0x within two years of completion. Bain Capital and the Kriete family are each expected to remain significant minority shareholders, which may help preserve continuity in a business whose performance depends on labor management and customer relationships. Completion is anticipated in AAR’s fiscal third quarter ending February 2027, subject to regulatory approvals and customary closing conditions.

Strategic Rationale and the Nearshore Labor Advantage

MRO Holdings generated approximately $1.0Bn of calendar year 2026 sales and $285.0MM of adjusted EBITDA, a margin of roughly 27.0%. That margin sits well above AAR’s current group profitability, and the pro forma arithmetic appears straightforward: adjusted EBITDA margin is guided to approximately 16.0% before synergies, rising to a targeted 19.0% to 20.0% within three to four years of closing. Management has identified approximately $75.0MM of run-rate cost synergies over the same period, drawn from procurement, operating practices and SG&A. A further $150.0MM of present value is attributed to transaction-related tax benefits.

The strategic case likely rests on labor. Heavy airframe maintenance remains labor-intensive, and the ability to perform it at competitive cost close to the U.S. market is probably the most valuable attribute MRO Holdings brings. Its five facilities across El Salvador, Mexico, Colombia and the United States generate approximately 90.0% of revenue from U.S. customers, which suggests a nearshore model rather than an export one. AAR’s parts and distribution businesses tend to benefit when aircraft pass through its own hangars, so the acquisition may function less as a bolt-on and more as a channel for pull-through demand.

Competitive Positioning in a Capacity-Constrained Market

Heavy maintenance capacity has been tight for several years, and the constraint appears structural rather than cyclical. Airlines are operating older fleets for longer as new aircraft deliveries run behind schedule, which raises the volume of check work on existing airframes. Hangar space, certified technicians and regulatory approvals are all slow to add, so a buyer seeking scale has limited alternatives to acquisition. Against that backdrop, 10.7x appears reasonable rather than aggressive for an asset of this margin profile, particularly once the stated synergies and tax benefits are taken into account.

The combined business would operate approximately 115 heavy maintenance lines and service close to 3,000 aircraft a year. Scale in this segment probably matters more than it does in parts distribution, because airlines value predictable turnaround times and a provider able to absorb schedule disruption across multiple sites. Whether that converts into pricing power is less certain, since large carriers negotiate hard and retain some in-house capability. A larger network may nonetheless improve utilization, since work can be routed to whichever facility has availability, and higher throughput would likely support the margin targets management has set.

Broader Implications for Aerospace Aftermarket M&A

The transaction fits a pattern that has been building across the aftermarket for some time. Buyers with public currency and access to committed financing have been willing to pay firm multiples for installed capacity, and sponsors holding those assets have found a receptive market for exits. Bain Capital’s position in MRO Holdings is a reminder that much of the independent MRO base passed through private equity ownership during the last cycle, and a number of those holdings are now reaching the end of their natural horizons.

Two features of the structure may prove influential. The first is the staged acquisition of control, which allows a strategic buyer to consolidate a target while deferring part of the purchase price and keeping founding shareholders aligned through the integration period. The second is the financing mix, which pairs committed debt with equity issued directly to sellers and a private placement. All-cash funding of a $4.0Bn asset would likely strain most balance sheets in the sector, so this combination may become a more common template for aftermarket consolidation.

Conclusion

AAR appears to be paying a full but defensible price for capacity that would take many years to build from scratch, and it has structured the purchase so that the capital commitment is spread across several years. Execution risk remains, since integrating roughly 10,000 employees across four countries is rarely straightforward, and the synergy target depends on procurement and operating changes that usually take time to land. Regulatory review may take time given the combined share of heavy maintenance capacity, although the fragmented nature of the broader market could ease that path. For participants in the aerospace aftermarket, the transaction suggests that control of physical capacity, rather than scale in distribution alone, is where buyers currently appear willing to commit capital. The terms on which that control is acquired may prove as important as the price paid for it.

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