AAR Buys the Crown Jewel of Heavy Maintenance, and the Market Blinks

AAR Corp. did nearly everything right in its fiscal first quarter, and the market punished it anyway. Revenue rose 24% year over year to $918 million, gross margin crept up to 19.2%, adjusted EBITDA margin expanded 100 basis points to 12.7%, and adjusted EPS climbed 38% to $1.49. Management raised the full-year sales outlook. The stock still fell 6% on the day — because the headline wasn't the quarter. It was the $4 billion bet sitting beside it.

The deal that rewires the story

AAR agreed to acquire a 65% controlling interest in MRO Holdings, an airframe heavy-maintenance provider with facilities across El Salvador, Mexico, Colombia and the U.S., for an implied enterprise value of roughly $4 billion — a 10.7x multiple on adjusted EBITDA net of tax benefits and synergies. Pro forma, the transaction “increases AAR's revenue by approximately 30% and improves adjusted EBITDA margin from roughly 12% to 16% before synergies.” — John Holmes, Chairman, President and Chief Executive Officer · 2026-09-29 Management then sets a fresh medium-term target of 19% to 20% adjusted EBITDA margin within three to four years.

The target asset is genuinely best-in-class. MRO Holdings is expected to produce roughly $1 billion of adjusted sales and $285 million of adjusted EBITDA (a 27% margin) in calendar 2026, alongside more than $200 million of operating cash flow. Bolted to AAR, the combined company would carry about $4.3 billion of sales and nearly $700 million of adjusted EBITDA — a scale that John Holmes frames as category-defining, and one that visibly moves him:

Sorry, I get choked up every time I say that 3,000 number.

The strategic logic is a genuine network effect, not a slogan: roughly 3,000 aircraft flowing through the combined hangars annually feed high-margin Component MRO work and, critically, data. Holmes was explicit that the deal is about more than heavy maintenance — it strengthens OEM partners relationships by giving visibility into parts demand, and it widens the funnel for the software solution business. This is the transaction eight years in the making. “This is a combination we have been talking about with MRO Holdings in various ways for about 8 years.” — John Holmes, Chairman, President and Chief Executive Officer · 2026-09-29

A story that has quietly rotated

The most revealing signal is what the keyword record shows has stopped leading. For several quarters, AAR's crown jewel has been new parts distribution — the growth engine that carried 20%+ organic clips and the recurring theme of nearly every prior call. In the current quarter, "New parts Distribution" is the single largest declining keyword in the set, while Airframe MRO, Heavy maintenance, wide body and turnaround time all surge to the top. AAR's narrative center of gravity has shifted from the parts shelf to the hangar floor.

Yet this is not a brand-new theme — the company has been steadily building toward it. Holmes made the case a full three quarters earlier, defending the heavy-maintenance economics against skeptics: “It is not a low-margin business. We have made more margin gains in the heavy maintenance area since over the last since coming out of COVID than anywhere else.” — John Holmes, Chairman, President, and Chief Executive Officer · 2026-01-06 What changes now is magnitude: the fragmented Airframe MRO market AAR has been consolidating piecemeal via HAECO and new-build hangars in Oklahoma City and Miami is suddenly being scaled in one decisive stroke.

Leverage is the new question

The market's real worry is the balance sheet. Net leverage jumps to roughly 3.6x at closing — up from 1.81x this quarter — funded by ~$1 billion of AAR equity (roughly $780 million issued to current MRO Holdings shareholders at $135 per share plus a ~$230 million PIPE) and ~$2.1 billion of new debt. The sellers retain ~35% and end up holding about 12% of AAR, a structure designed to keep them aligned. As Dylan Wolin put it, “We expect net leverage to be approximately 3.6x at closing, including the full amount of the run rate synergies.” — Dylan Wolin, Chief Financial Officer · 2026-09-29 The path back to a 2-to-2.5x range depends on directing 100% of MRO Holdings' excess cash flow to repay an intercompany loan for the first two years.

That is a striking pivot for a company that had just fought its way back into its leverage comfort zone. Effective net cash sits at -$766 million, and as recently as mid-2025 the capital-allocation script pointed toward returns, not new equity. Then-CFO Sean Gillen laid it out plainly: “if we did and then we got towards the low end of the leverage range, I think repurchase is where we would choose to put capital rather than bringing a dividend back in.” — Sean M. Gillen, Chief Financial Officer · 2025-07-16 Instead, share repurchases have gone to $0 and the company is issuing equity to buy scale.

The tape tells the same round-trip story. AIR ran up 48% in nine weeks, then gave back 31% in seven — a full loop into the print, leaving the stock 34% below its August 17 peak of $153.71. Price-to-revenue has compressed to 1.2x from a 1.7x peak. For a name that thrived on a repeatable, asset-light distribution story, investors are now being asked to underwrite a capital-intensive, debt-funded integration — and they hesitated.

What to watch

Two risks dominate. First, integration bandwidth. AAR closed four deals in fiscal 2026 and is now digesting its largest ever. Scott Mikus asked the obvious question: “is there any concern about trying to digest all these deals at once? Do you feel like the management bandwidth might be a little bit stretched.” — Scott Mikus, Analyst · 2026-09-29 Holmes' answer is that HAECO was a distressed turnaround while MRO Holdings is bringing two high performers together — a fair distinction, but one the market will test.

Second, execution on the still-unfinished HAECO restructuring: Repair, Engineering & Software margin fell 120 basis points on expected dilution, with the full exit of the high-cost Indianapolis facility slated for the end of the calendar year. Interest coverage of 3.3x is the metric to watch as the financing lands, alongside management's insistence that demand remains firm: Holmes noted on the call that "we are not seeing a slowdown anywhere in our bookings."

What makes this dossier worth reading is the tension, not the consensus. AAR delivered a great quarter and the market sold it because the company just traded a clean, deleveraging, buyback-ready story for a transformational one that runs through 3.6x leverage and a two-year paydown clock. Holmes was candid that the deal wasn't for sale: “They were not for sale. We approached them.” — John Holmes, Chairman, President and Chief Executive Officer · 2026-09-29 Now the question is whether AAR can convert a genuinely powerful network effect into the 19% to 20% margins it just promised — and whether shareholders are patient enough to find out.