AAR Corp. (AIR)

Executive Summary / Key Takeaways

• AAR Corp is executing a deliberate portfolio transformation, divesting low-margin businesses like Landing Gear Overhaul while acquiring higher-margin, higher-growth assets such as ADI Electronics and HAECO Americas, driving adjusted EBITDA margins from 9.6% in FY2022 toward 12% and creating a structurally more profitable business.

• The company's unique "two-way exclusive" distribution model and integrated platform approach—combining Parts Supply, Repair & Engineering, and software-enabled Integrated Solutions—creates switching costs and cross-selling opportunities that competitors HEICO (HEI) and TransDigm (TDG) cannot replicate, supporting sustainable market share gains in new parts distribution growing at 20%+ annually.

• Management's capital allocation discipline is evident in net leverage reduction to 2.49x (within the 2.0-2.5x target range), strategic divestitures generating cash, and a $274 million equity raise that provides dry powder for accretive M&A while maintaining financial flexibility.

• Near-term margin pressure from HAECO integration masks underlying strength; the company expects 12-18 months to improve HAECO's low single-digit EBITDA margins to current Repair & Engineering levels, with Oklahoma City and Miami expansions adding $60 million in high-margin revenue starting FY2027, creating a clear earnings inflection point.

• The investment thesis hinges on successful integration of recent acquisitions and continued organic growth in new parts distribution; key risks include defense budget concentration (40%+ of revenue), potential margin compression in USM from tight supply, and execution challenges in consolidating the Indianapolis facility into HAECO's Greensboro operations.

Setting the Scene: The Aerospace Aftermarket Value Chain

AAR Corp, founded in 1951 and headquartered in Wood Dale, Illinois, operates in the $88 billion global aviation aftermarket, providing parts supply, maintenance repair and overhaul (MRO), and integrated logistics solutions to commercial airlines and government customers. The company generates revenue through four segments: Parts Supply (40% of FY2025 sales), Repair & Engineering (32%), Integrated Solutions (25%), and Expeditionary Services (3%). This positioning is significant because it places AAR at the intersection of two powerful trends: aging aircraft fleets requiring more maintenance and airlines outsourcing non-core activities to specialized providers.

The aerospace aftermarket operates as a defensible oligopoly. High regulatory barriers—FAA certifications for MRO facilities, DLA approvals for defense contracts, and proprietary technical data rights—limit new entrants and protect incumbents. AAR's two-way exclusive distribution model, where the company does not represent competing products and OEM partners do not use competing distributors, creates deeper relationships and technical proficiency than traditional distribution. This structural advantage explains why AAR has emerged as the largest independent provider of new parts distribution, a position that drives pricing power and recurring revenue.

AAR's strategic evolution over the past three years reveals a deliberate pivot toward higher-margin activities. The 2020 divestiture of its COCO business, the 2024 sale of Landing Gear Overhaul for $51 million, and the 2025 exit from the Indianapolis facility represent a systematic shedding of commoditized, capital-intensive operations. Simultaneously, the $120 million Trax acquisition in March 2023, $725 million Triumph (TGI) Product Support deal in March 2024, and recent purchases of ADI ($138 million), HAECO Americas ($77 million), and Aerostrat ($15 million) build a vertically integrated platform. This transformation shifts the earnings mix from cyclical, low-margin overhaul work toward sticky, high-margin distribution and software services, fundamentally altering the company's risk profile.

Technology, Products, and Strategic Differentiation

AAR's competitive moat rests on three integrated pillars that competitors cannot easily replicate. First, the Parts Supply segment's two-way exclusive distribution contracts, typically five to ten years in duration, create technical lock-in. Unlike traditional distributors that simply buy inventory and act as call centers, AAR becomes technically proficient in its OEM partners' products, helping them take market share while securing its own position. This model drives the segment's 20%+ organic growth rate over four consecutive years and supports gross margins of 19.4% on commercial sales, even as volumes surge.

Second, the Repair & Engineering segment has achieved industry-leading turnaround times and quality in airframe heavy maintenance, positioning AAR as a top choice in North America for this service. Management emphasizes that heavy maintenance is a viable business, having expanded margins to low double-digit EBITDA levels since COVID. The segment's component repair business operates at mid-to-high teens operating margins, and AAR leverages its heavy maintenance leadership to drive volume into these higher-margin component shops. This creates a self-reinforcing cycle: superior turnaround times attract more heavy maintenance customers, which feeds component repair volume, enhancing overall segment margins.

Third, the Integrated Solutions segment houses Trax, a high-margin, high-growth software platform that has doubled revenue to over $50 million in two years and is targeting another doubling. The recent Delta Airlines (DAL) win demonstrates AAR's ability to leverage customer relationships to open doors for Trax, while the Aero Exchange partnership enhances integration capabilities. Approximately 30-35% of Trax customers have upgraded to the new system, with a goal to complete migrations by 2028. This software moat provides recurring revenue, high incremental margins, and creates a proprietary sales channel for parts and repair solutions, differentiating AAR from pure-play distributors or component manufacturers.

Financial Performance & Segment Dynamics: Evidence of Strategic Execution

Financial results provide evidence that the portfolio transformation is working. Consolidated Q2 FY2026 sales increased 15.9% to $795.3 million, with commercial sales up 13.2% and government sales up 23.1%. The gross profit margin on government sales expanded to 20.4% from 16.6%, driven by favorable mix and recently awarded contracts. This margin expansion demonstrates that AAR's government business is a growing, profitable platform that funds commercial expansion.

The Parts Supply segment delivered strong performance, with Q2 FY2026 sales up 29.2% to $353.6 million and adjusted EBITDA margins expanding to 13.2% from 12.4%. New parts distribution activities grew 32% organically, excluding the ADI acquisition, with management noting no signals of destocking from airline customers. This volume-driven growth, combined with the ADI acquisition contributing $19.3 million in sales, validates the strategy of scaling distribution to gain market share. The segment's operating margin of 11.6% represents a 10 basis point improvement year-over-year, proving that growth is not coming at the expense of profitability.

Repair & Engineering presents a more nuanced picture. Q2 FY2026 sales grew 6.9% to $244.5 million, but operating margin compressed to 9.3% from 10.0%. The HAECO Americas acquisition contributed $19.4 million in sales but at lower profitability, while the divestiture of LGO removed $20.4 million in Q2 FY2025 sales. Management states HAECO will be margin dilutive for 12-18 months as integration progresses, with the goal of improving its low single-digit EBITDA margins to current segment levels. This temporary compression masks underlying strength; organic sales growth excluding the LGO divestiture was 8%, and the segment maintains high utilization with capacity sold out through the end of the decade. The Oklahoma City expansion, substantially completed by January 2026, and Miami expansion coming online in July 2026 will add $60 million in annual revenue, providing a margin inflection point in FY2027.

Integrated Solutions delivered dramatic margin improvement, with Q2 FY2026 operating margin jumping to 7.9% from 4.0% and adjusted EBITDA up 50%. This 390 basis point expansion resulted from favorable mix and government contracts achieving key milestones. The segment's 7.6% sales growth to $175.8 million demonstrates the scalability of the software and logistics platform. With Trax targeting another revenue doubling and the Aerostrat acquisition adding maintenance planning capabilities, this segment represents high long-term margin potential.

Balance sheet strength supports the transformation. As of November 30, 2025, AAR held $75.6 million in cash with $555 million available on its $825 million revolving credit facility. Net debt leverage of 2.49x sits within the 2.0-2.5x target range, down from 2.82x in Q1 FY2026. The company issued $150 million in additional Senior Notes in August 2025 and completed a $274 million equity offering in Q2 FY2026, providing liquidity for acquisitions. Net cash used in operating activities was $31.3 million in the first half of FY2026, primarily due to working capital investments of over $50 million in inventory to support growth. Management expects to be cash positive in Q3 FY2026 and for the full fiscal year, indicating the working capital build is temporary.

Outlook, Management Guidance, and Execution Risk

FY2026 guidance signals confidence in the transformation trajectory. Total sales growth is expected to approach 17%, with organic growth approaching 11%—an increase from the 9% organic forecast provided in July. Q3 FY2026 guidance calls for 20-22% total sales growth and 8-11% organic growth, with adjusted operating margins of 9.8-10.1%. This margin forecast includes a sequential step-down due to HAECO integration, but management views the current Repair & Engineering margin as a low point from which expansion will resume.

The HAECO Americas integration timeline is critical. Management expects 12-18 months to improve margins from low single-digit EBITDA to current segment levels, with actions including footprint rationalization, process improvements, and revenue optimization. The Indianapolis closure, expected to complete in FY2027, will eliminate a high-cost facility and redistribute work to Greensboro and other sites. This consolidation demonstrates disciplined cost management and is expected to drive 200-300 basis points of margin improvement in heavy maintenance over the next two years.

Capacity expansions provide visible growth. The Oklahoma City facility, substantially completed in January 2026, and Miami expansion, coming online in July 2026, will add $60 million in annual revenue. Management notes this capacity is already sold out through the end of the decade, indicating strong underlying demand and pricing power. The full impact will be more pronounced in FY2027, creating a multi-year earnings tailwind.

In Parts Supply, management expects to outgrow the market in distribution at a mid-teens rate, with USM margins expected to expand as supply loosens. USM currently represents 15% or less of the portfolio, down from historical levels, reducing cyclicality. The extended CFM56 engine material distribution agreement with FTAI (FTAI) through 2030 provides revenue visibility in a key product line.

Capital allocation priorities remain clear: fund organic growth, pursue value-accretive M&A, and return capital through buybacks rather than dividends. Management states that absent M&A, the company would prioritize repurchases over reinstating a dividend, signaling confidence in the stock's value. With net leverage at target levels and strong cash generation expected in the second half, AAR has flexibility for additional acquisitions.

Risks and Asymmetries: What Could Break the Thesis

Defense concentration remains a material risk, with government customers representing over 40% of revenue. While the U.S. Navy's P-8 fleet program demonstrates AAR's ability to deliver cost savings that protect its position, a major defense budget cut or shift in procurement strategy could impact the Integrated Solutions segment's growth trajectory. The termination for convenience of the Next Generation Pallet contract, which resulted in $12.7 million in expensed costs and a $9.5 million contract asset recognition, illustrates the vulnerability of government work, though management notes this was an unusual event.

M&A integration risk is elevated given the pace of acquisitions. The HAECO Americas purchase brings two facilities and 600 employees, with management noting it will be margin dilutive for two to three quarters. If integration takes longer than 18 months or cost synergies fail to materialize, the expected margin inflection in Repair & Engineering could be delayed. The ADI acquisition requires successful cross-selling through AAR's OEM relationships to justify the $138 million purchase price.

USM margin pressure presents a near-term headwind. While management expects supply to loosen and margins to expand, the current tight supply has narrowed spreads on used serviceable material. If aircraft retirements remain slow or demand for engine parts accelerates faster than supply, USM margins could remain depressed, limiting overall Parts Supply profitability. However, USM's declining share of the portfolio mitigates this risk.

The performance guarantee retained from the divested Composites business represents a contingent liability. A customer claims at least $32 million in losses related to product delivery non-compliance, which AAR disagrees with and believes it has numerous defenses. While management states it is possible that a loss will be incurred, the inability to estimate a range creates uncertainty. A negative outcome could result in a material charge, though the company's $75 million cash position and credit facility provide cushion.

Tariff impacts require monitoring. Management is paying attention to the changing landscape but is not buying ahead of any tariffs. The key risk is whether AAR can pass through OEM price increases to end users. Given the company's scale and exclusive relationships, it has historically maintained pricing power, but a broad trade war could compress gross margins.

Valuation Context

Trading at $101.33 per share, AAR commands a market capitalization of $4.01 billion and an enterprise value of $4.98 billion. The stock trades at 15.04x TTM EBITDA and 1.68x revenue, a discount to direct competitors HEICO (32.13x EBITDA, 8.77x revenue) and TransDigm (20.24x EBITDA, 10.32x revenue). This valuation gap reflects AAR's lower operating margins but also suggests potential upside if margin expansion continues.

On a price-to-sales basis, AAR's 1.35x multiple is less than Triumph's 2.06x and a fraction of HEICO's 8.29x, indicating the market has not fully priced in the portfolio transformation. The P/E ratio of 39.58x appears elevated relative to near-term earnings, but this reflects temporary integration costs and working capital investments that management expects to reverse in the second half of FY2026.

Balance sheet metrics support a premium valuation. The current ratio of 2.85x and quick ratio of 1.06x demonstrate strong liquidity, while debt-to-equity of 0.67x is conservative for an acquisitive company. Net leverage of 2.49x sits at the low end of the 2.0-2.5x target range, providing firepower for additional M&A. Return on assets of 5.59% and return on equity of 6.86% are impacted by integration costs but should improve as margins expand.

The absence of a dividend, with management preferring buybacks, suggests capital will be returned when leverage reaches the lower end of the target range without M&A opportunities. This capital allocation discipline is appropriate for a company in active transformation.

Conclusion

AAR Corp has engineered a compelling margin transformation story by divesting commoditized operations and acquiring higher-margin, higher-growth businesses that create an integrated aerospace aftermarket platform. The company's two-way exclusive distribution model, industry-leading MRO capabilities, and rapidly scaling Trax software solution generate switching costs and cross-selling opportunities that competitors cannot easily replicate. Financial performance validates the strategy, with Parts Supply delivering 20%+ organic growth and Integrated Solutions expanding margins by 390 basis points.

The near-term investment case hinges on successful execution of the HAECO Americas integration and realization of cost synergies from the Triumph Product Support acquisition. While margins will be temporarily dilutive for 2-3 quarters, management's track record of improving heavy maintenance margins from breakeven to low double-digit EBITDA provides confidence. The Oklahoma City and Miami expansions, coming online in calendar 2026, provide visible revenue growth with capacity already sold out through the end of the decade.

Valuation at 15x EBITDA and 1.7x revenue does not fully reflect the structural improvement in earnings power. If AAR achieves its target of mid-teens operating margins as HAECO integration completes and Trax scales, the multiple gap with HEICO and TransDigm should narrow, providing meaningful upside. The key variables to monitor are defense budget stability, USM supply dynamics, and the pace of HAECO margin improvement. If management executes as guided, AAR will emerge as a higher-quality, more defensible business deserving of a premium multiple.