AAR: The Market Has Rewarded the Growth Story. Now Comes the Cash-Flow Test.

The Jefferies Global Industrials Conference takes place September 9 in New York, and it is exactly the kind of event that matters for AAR Corp -- not because of what gets said on a stage, but because of where this stock has ended up before the microphones go live. AAR has nearly doubled over the past 52 weeks, climbing from $73 to a high of $154, before pulling back 17 percent in the last month to close near $124. The market has clearly voted on the growth narrative. The question now is whether the underlying cash flow and margin trajectory can justify that vote.

AAR is the largest aviation maintenance, repair, and overhaul provider in North America. It supplies parts, repairs aircraft, runs software platforms for airlines, and manages fleet programs for the U.S. government. Over the fiscal year ended May 2026, the company generated $3.3 billion in revenue, up 19 percent. Adjusted EBITDA reached $401 million, a 12.1 percent margin. The company beat fiscal 2026 fourth quarter earnings estimates by about 10 percent, with adjusted diluted EPS of $1.53.

The growth is real. The Parts Supply segment led with 39 percent growth. Repair, Engineering, and Software posted 35 percent growth driven by component MRO volume, airframe MRO demand, and recurring software revenue. But growth alone does not tell the cash-flow story. And that is where the evidence needs closer scrutiny.

AAR generated $99 million in operating cash flow over the trailing twelve months. That works out to a 3 percent cash-flow margin on $3.3 billion in revenue. After $65 million in capital expenditures, free cash flow is $33 million -- roughly 1 percent of revenue. On a $5 billion market capitalization, that free cash flow yield is about 0.7 percent. For a company the market has rewarded with a 67 percent one-year return, that is thin.

Compare that to Heico, the closest structural peer in the aviation aftermarket. Heico generates a 19 percent free cash-flow margin, a 23.5 percent operating margin, and 27.8 percent EBITDA margin. Heico trades at 33x EV/EBITDA to AAR's 17x. The multiple gap is not a mispricing error -- it reflects a real difference in operating quality and capital efficiency. AAR earns an 8.5 percent operating margin and 8.9 percent return on invested capital. Heico runs at nearly triple AAR's operating margin and generates free cash flow at a rate that supports aggressive buybacks and acquisitions without straining the balance sheet.

The comparison matters because it establishes what the AAR share price is buying. You are not buying a Heico. You are buying a lower-margin, capital-intensive MRO operator that is trying to climb its way toward a better margin profile. The discount to Heico is not a gap that will necessarily close. It reflects structural operating differences.

Management has a plan to close that gap. Two moves dominate the strategy.

First, the company announced in May that it is winding down its Legacy Commercial Programs business -- a collection of asset-heavy, flight-hour-based component repair contracts for commercial airlines. Over the last 12 months, that segment generated $252 million in revenue and $5 million in adjusted operating income. At roughly a 2 percent operating margin, it barely covered its capital cost. The wind-down should take three to four years. Stripping it out improves the consolidated margin mechanically by less than a percentage point, but it also removes a business that was consuming capital without generating returns. Management expects to redeploy teams to higher-growth areas and realize periodic gains as assets are divested.

Second, AAR acquired HAECO Americas for $78 million in cash. The purchase price represented a high single-digit multiple of EBITDA. In connection with the deal, AAR secured multi-year heavy maintenance contracts worth over $850 million, effectively booking out the capacity at both HAECO facilities in Greensboro, North Carolina, and Lake City, Florida for years to come. The acquisition added 1,600 employees. Management expects it to be slightly dilutive to operating margins initially, with profitability improvement coming as AAR applies its lean operating model to the new facilities. The expected endpoint is margins consistent with AAR's current airframe MRO operations.

The strategic logic is straightforward. Drop the low-return tail. Buy the #2 player in your largest segment at a reasonable multiple with contracted revenue. Improve the margin profile. The risk is execution -- integrating 1,600 new employees across two new facilities while maintaining service quality for $850 million in contracted work is not a trivial lift. And the margin improvement is incremental, not a step function. A 0.5 to 1.0 percentage-point improvement on a 12 percent base takes patience.

This is where the conference presentation carries weight. Investors will want to hear how HAECO integration is progressing, whether the initial dilution is materializing as expected, and whether the multi-year contracts are tracking to plan. Management also guided fiscal 2027 organic revenue growth to the low double-digits, with adjusted EBITDA margin in the low-to-mid teens -- implying continued margin expansion. First quarter guidance was more aggressive, at 21-23 percent organic sales growth.

From a balance-sheet perspective, AAR carries $1.65 billion in total debt with $84 million in cash. Net leverage sits at 2.03x net debt to EBITDA, within the company's stated target range of 2.0x to 2.5x. The quick ratio is 124 percent and the current ratio is 284 percent. The balance sheet is manageable but not pristine -- and at this debt level, the company needs those cash flows to keep working. A sustained downturn in aviation activity or a significant integration misstep at HAECO would tighten things quickly.

Valuation sits in the uncomfortable middle. At 17x EV/EBITDA and roughly 25x trailing earnings, AAR is not cheap. It is not absurdly expensive either -- the 14 percent organic growth rate justifies a premium over stagnant industrials. But the valuation assumes the margin expansion and growth trajectory hold. If the HAECO integration takes longer than expected, or if organic growth decelerates from 14 percent into the low-teens that management projects for fiscal 2027, the multiple could compress. The recent 17 percent pullback may reflect investors who see that risk before management does.

The investment case for AAR does not rest on cheapness. It rests on execution. Can management wind down the legacy business without disrupting the core? Can the HAECO integration deliver the margin improvement without a prolonged earnings drag? Can the company maintain its growth trajectory as the organic rate normalizes? The September 9 presentation will not answer those questions definitively. But the answers will determine whether the stock earns its valuation or revises it downward.