AAR Corp.: An Interesting Aviation Stock But No Longer Cheap

AAR Corp. is described as a stronger aviation aftermarket platform, supported by an aging and expanding global aircraft fleet plus delayed new aircraft deliveries. Management is targeting 15% annual EPS growth, 6-10% revenue growth, and EBITDA margins above 13% over the next three years, with Parts Supply highlighted as the fastest-growing, highest-margin segment. Repair & Engineering is still more operationally intensive, but the overall setup points to improving fundamentals and a constructive multi-year outlook.

Analysis

This is less a cyclical upturn than a structural margin-reset: the aftermarket is becoming the scarce-capacity layer in aviation, and that shifts bargaining power away from OEMs toward service/parts providers. The key second-order effect is that delayed new-delivery schedules extend the installed-base “hold period,” which increases wear-and-tear demand while also forcing airlines to keep more legacy aircraft in the air longer, a multi-year tailwind for consumables and spares. That dynamic should also pressure smaller MRO shops that lack OEM-backed inventory access or working capital, because customers will pay up for reliability and turnaround certainty rather than chase the lowest sticker price.

The main risk is not demand disappearance but normalization of the bottleneck: if engine and airframe production rates inflect meaningfully over the next 12–24 months, some of this aftermarket urgency migrates back to new-equipment spend, compressing parts scarcity premiums. Another hidden risk is mix: the higher-margin parts business can mask rising complexity in repair workflows, so any labor or facility bottleneck could cap incremental margin even if revenue keeps growing. On the positive side, long-dated OEM contracts create a defensive moat, but they also raise the bar for capital discipline because contract wins can tempt management into inventory build or capacity expansion ahead of cash conversion.

Consensus seems to be underestimating how long the supply-chain distortion can persist in aviation because fleet aging is cumulative, not cyclical; each quarter of delivery slippage compounds the installed base that needs support. The move looks justified, but the setup is likely better as a relative-value long than a blind outright long, since the market may already be pricing some of the earnings acceleration while underappreciating execution variance in the repair segment. Over 6–12 months, the best upside comes if margins expand before growth decelerates, not simply from top-line beats.

Key Decisions for Investors

• Long AIR on a 6–12 month horizon; favor entry on any post-print pullback. Base case is continued multiple support if margin expansion tracks guidance, with downside capped by recurring aftermarket demand; risk is a 12–18 month normalization in delivery rates.
• Pair trade: long AIR / short a lower-quality aerospace services or generic industrial maintenance name with weaker OEM ties. The spread should work if scarcity value and contract stickiness keep AIR’s margin profile ahead over the next 2–4 quarters.
• Use call spreads rather than stock if initiating now: AIR 6–9 month call spreads to express upside from guidance credibility while limiting risk if repair mix or working-capital drag causes a miss.
• Monitor any acceleration in aircraft production rates as a de-risking trigger. If OEM output inflects for two consecutive quarters, reduce exposure by 25–50% because aftermarket scarcity premiums can unwind faster than consensus expects.
• Watch for inventory build and receivables growth as an early warning sign. If working capital expands faster than EBITDA for one quarter, trim because the market will likely re-rate the story from growth to cash conversion.