AAR CORP. is a leading independent provider of solutions to the global aviation aftermarket. The company offers a broad line of products and services to commercial and government aerospace customers. It operates globally in over 20 countries through four business segments: Parts Supply, Repair & Engineering, Integrated Solutions and Expeditionary Services.
AAR generates revenue primarily through the sale and leasing of used serviceable material and distribution of new…
AAR CORP. is a leading independent provider of solutions to the global aviation aftermarket. The company offers a broad line of products and services to commercial and government aerospace customers. It operates globally in over 20 countries through four business segments: Parts Supply, Repair & Engineering, Integrated Solutions and Expeditionary Services.
AAR generates revenue primarily through the sale and leasing of used serviceable material and distribution of new OEM-supplied replacement parts in its Parts Supply segment. The Repair & Engineering segment earns revenue from airframe maintenance and component repair services. Integrated Solutions generates income from fleet management, supply chain logistics programs, flight hour component inventory and repair programs, and integrated software solutions including Trax. Expeditionary Services derives revenue from the design, manufacture, and repair of transportation pallets, containers, shelters, and specialized command and control systems for government and humanitarian operations.
The company operates through the following segments: Parts Supply, Repair & Engineering, Integrated Solutions and Expeditionary Services.
• Parts Supply: This segment primarily consists of sales and leasing of USM and aftermarket distribution of new, original equipment manufacturers supplied replacement parts. It accounted for approximately 40% of sales in fiscal 2025. AAR develops digital solutions including the online PAARTS sm Store, which facilitates electronic order fulfillment.
• Repair & Engineering: This segment primarily provides airframe maintenance and component repair services. It accounted for approximately 32% of sales in fiscal 2025. The segment also develops Parts Manufacturer Approval parts and proprietary designated engineering representative repairs for aftermarket applications.
• Integrated Solutions: This segment primarily consists of fleet management and operations of customer-owned aircraft, customized performance-based supply chain logistics programs in support of the U. S. Department of Defense and foreign governments, flight hour component inventory and repair programs for commercial airlines, and integrated software solutions including Trax. It accounted for approximately 25% of sales in fiscal 2025. Through Trax, AAR provides a fully cloud-based electronic enterprise resource platform for the MRO industry and offers paperless mobility apps that automate MRO workflows with artificial intelligence.
• Expeditionary Services: This segment primarily consists of products and services supporting the movement of equipment and personnel by the U. S. and foreign governments and non-governmental organizations. It accounted for approximately 3% of sales in fiscal 2025. The segment designs, manufactures, and repairs transportation pallets and a wide variety of containers and shelters used in military and humanitarian tactical deployment activities.
AAR maintains a satisfactory competitive position in the aviation aftermarket through its responsiveness to customer needs, attention to safety and quality, unique portfolio of high-quality solutions with lower cost to the customer, combination of market expertise and deep technical knowledge, long-standing customer relationships, and integrated, connected business model. Aviation competitors include OEMs, the service divisions of large commercial airlines, and other independent suppliers of parts, repair, and overhaul services to the commercial and defense markets.
The principal customers for AAR's products and services are domestic and foreign passenger airlines, domestic and foreign cargo airlines, regional and commuter airlines, business and general aviation operators, OEMs, aircraft leasing companies, aftermarket aviation support companies, the DoD and its contractors, the DoS, and foreign military organizations or governments.
Sectors:Industrials · TechnologySector rationaleAAR CORP. primarily operates in the aviation aftermarket, generating the vast majority of its revenue from parts distribution, airframe maintenance, component repair, and the manufacture of transportation pallets for government customers. These activities fall under Industrial Machinery, Commercial Aerospace, and Logistics within the Industrials sector. A secondary sector of Technology is justified because the company owns and operates Trax, a cloud-based enterprise resource platform and AI-driven software for the MRO industry, which is sold as an integrated software solution.Industries:Commercial AerospaceIndustrialsPrimaryAAR CORP. is a leading provider for the global aviation aftermarket, generating significant revenue from the sale and leasing of used serviceable material and the distribution of new OEM replacement parts for commercial and government aerospace customers. Its Repair & Engineering segment specifically provides airframe maintenance and component repair services for the civil aviation market.DefenseIndustrialsSecondaryThe company provides customized supply chain logistics programs for the U.S. Department of Defense and foreign governments, and its Expeditionary Services segment designs and manufactures transportation pallets, containers, and command and control systems for military tactical deployment.ERP SoftwareTechnologySecondaryThrough its Trax product, AAR provides a cloud-based electronic enterprise resource platform (ERP) specifically for the MRO industry, which automates workflows and manages core enterprise operations.Classified using BQ-MICSCIK: 0000001750
Investment Thesis
▲ Bull case
AAR's strategic focus on high-growth, high-margin segments such as new parts distribution and software positions the company for sustained outperformance, with organic growth in new parts distribution reaching 36% in Q3 FY26 and Trax software demonstrating strong recurring revenue momentum through expanded customer deployments like Delta, which is scaling from 2,000 to 6,000 users with additional functionality phases set to drive revenue over the next 6-7 quarters, creating a predictable and scalable growth engine that the market may be underestimating as a long-term value driver beyond traditional aftermarket parts.
The launch of Airvoyant, an AI-powered aviation procurement solution built on AWS and integrated with Trax and ERP systems, represents a significant hidden catalyst that management did not heavily promote during the earnings call but has the potential to transform parts sourcing by automating manual RFQs, enabling autonomous ordering through AI agents, and unlocking measurable savings on parts spend, with early adoption by major airlines including Delta, Air Canada, and JetBlue as launch partners signaling strong industry validation and a first-mover advantage in agentic AI for aviation procurement.
The integration of HAECO Americas is progressing ahead of schedule, with workforce rightsizing and revenue base alignment already completed, and the company expecting margin improvement to begin in Q3 FY27 as the Indianapolis facility transition concludes, meaning the current margin drag is temporary and the full benefits of the acquisition — including access to higher-margin component MRO work and expanded capabilities — will flow through in future periods, creating a hidden inflection point for profitability that is not yet reflected in consensus estimates.
AAR's disciplined capital allocation and strong cash flow generation, highlighted by $75 million in operating cash flow in Q3 FY26 and net leverage of 2.17x within the target range of 2.0x-2.5x, provide financial flexibility to fund strategic initiatives like Airvoyant and ART integration without overleveraging, while the planned wind-down of the Legacy Commercial Programs segment — which contributed $252.4 million in sales but only $5.0 million in adjusted operating income over the last twelve months — will simplify the business model, redeploy talent to higher-growth areas, and improve returns on capital over the next three to four years, creating a structural margin expansion opportunity that is underappreciated by the market.
AAR's strategic focus on high-growth, high-margin segments such as new parts distribution and software positions the company for sustained outperformance, with organic growth in new parts distribution reaching 36% in Q3 FY26 and Trax software demonstrating strong recurring revenue momentum through expanded customer deployments like Delta, which is scaling from 2,000 to 6,000 users with additional functionality phases set to drive revenue over the next 6-7 quarters, creating a predictable and scalable growth engine that the market may be underestimating as a long-term value driver beyond traditional aftermarket parts.
The launch of Airvoyant, an AI-powered aviation procurement solution built on AWS and integrated with Trax and ERP systems, represents a significant hidden catalyst that management did not heavily promote during the earnings call but has the potential to transform parts sourcing by automating manual RFQs, enabling autonomous ordering through AI agents, and unlocking measurable savings on parts spend, with early adoption by major airlines including Delta, Air Canada, and JetBlue as launch partners signaling strong industry validation and a first-mover advantage in agentic AI for aviation procurement.
The integration of HAECO Americas is progressing ahead of schedule, with workforce rightsizing and revenue base alignment already completed, and the company expecting margin improvement to begin in Q3 FY27 as the Indianapolis facility transition concludes, meaning the current margin drag is temporary and the full benefits of the acquisition — including access to higher-margin component MRO work and expanded capabilities — will flow through in future periods, creating a hidden inflection point for profitability that is not yet reflected in consensus estimates.
AAR's disciplined capital allocation and strong cash flow generation, highlighted by $75 million in operating cash flow in Q3 FY26 and net leverage of 2.17x within the target range of 2.0x-2.5x, provide financial flexibility to fund strategic initiatives like Airvoyant and ART integration without overleveraging, while the planned wind-down of the Legacy Commercial Programs segment — which contributed $252.4 million in sales but only $5.0 million in adjusted operating income over the last twelve months — will simplify the business model, redeploy talent to higher-growth areas, and improve returns on capital over the next three to four years, creating a structural margin expansion opportunity that is underappreciated by the market.
AAR's guidance for Q4 FY26 reflects a deceleration in organic adjusted sales growth to 6-8%, which management attributes to lapping a strong prior-year quarter, but this slowdown may signal underlying demand weakness in the commercial aftermarket that is being masked by acquisition-driven growth and government strength, particularly as airlines continue to make modest capacity adjustments in response to elevated fuel costs, and if these adjustments evolve into more significant fleet plan changes, the company's dependence on commercial customers (73% of sales) could expose it to a downturn in maintenance and parts demand that is not yet priced into the stock.
Despite management's confidence in the resilience of air travel demand, the company has not adequately addressed the risk that prolonged geopolitical conflicts — such as the ongoing situation in the Middle East referenced during the call — could disrupt global supply chains for aircraft parts, increase lead times, or trigger broader economic instability that reduces discretionary travel and corporate spending on MRO services, with no clear mitigation strategy discussed for potential sourcing disruptions beyond the speculative benefit of increased USM teardowns, which remains uncertain and not yet materializing in results.
The integration of HAECO Americas, while progressing ahead of schedule, continues to exert margin pressure on the Repair & Engineering segment, with adjusted EBITDA margin decreasing 190 basis points to 11.0% and adjusted operating margin falling 150 basis points to 9.6% in Q3 FY26, and although management expects improvement, the timeline for returning to pre-acquisition margin levels is tied to the completion of the Indianapolis facility transition in Q4 FY27, meaning investors may face an extended period of suboptimal profitability in a core segment that could weigh on overall earnings momentum if execution falters or cost savings are delayed.
AAR's reliance on government contracts, while a source of strength, introduces concentration risk, as shifts in defense spending priorities or delays in contract awards — such as the potential for budgetary constraints or changing geopolitical alignments — could abruptly impact the 30% of sales derived from government customers, and the company did not discuss contingency plans for reduced defense funding, leaving investors exposed to a binary outcome if political or fiscal headwinds emerge in the U.S. defense sector.
The announced wind-down of the Legacy Commercial Programs segment, while strategically sound, carries execution risk, as the process is expected to take three to four years and may involve unforeseen liabilities, asset impairment charges, or slower-than-anticipated redeployment of talent, with the segment currently generating only $5.0 million in adjusted operating income on $252.4 million in sales, suggesting that the wind-down may not yield the expected margin improvement if asset divestitures do not generate meaningful gains or if redeployed employees fail to contribute effectively to higher-growth initiatives, potentially resulting in a prolonged drag on profitability during the transition period.
AAR's guidance for Q4 FY26 reflects a deceleration in organic adjusted sales growth to 6-8%, which management attributes to lapping a strong prior-year quarter, but this slowdown may signal underlying demand weakness in the commercial aftermarket that is being masked by acquisition-driven growth and government strength, particularly as airlines continue to make modest capacity adjustments in response to elevated fuel costs, and if these adjustments evolve into more significant fleet plan changes, the company's dependence on commercial customers (73% of sales) could expose it to a downturn in maintenance and parts demand that is not yet priced into the stock.
Despite management's confidence in the resilience of air travel demand, the company has not adequately addressed the risk that prolonged geopolitical conflicts — such as the ongoing situation in the Middle East referenced during the call — could disrupt global supply chains for aircraft parts, increase lead times, or trigger broader economic instability that reduces discretionary travel and corporate spending on MRO services, with no clear mitigation strategy discussed for potential sourcing disruptions beyond the speculative benefit of increased USM teardowns, which remains uncertain and not yet materializing in results.
The integration of HAECO Americas, while progressing ahead of schedule, continues to exert margin pressure on the Repair & Engineering segment, with adjusted EBITDA margin decreasing 190 basis points to 11.0% and adjusted operating margin falling 150 basis points to 9.6% in Q3 FY26, and although management expects improvement, the timeline for returning to pre-acquisition margin levels is tied to the completion of the Indianapolis facility transition in Q4 FY27, meaning investors may face an extended period of suboptimal profitability in a core segment that could weigh on overall earnings momentum if execution falters or cost savings are delayed.
AAR's reliance on government contracts, while a source of strength, introduces concentration risk, as shifts in defense spending priorities or delays in contract awards — such as the potential for budgetary constraints or changing geopolitical alignments — could abruptly impact the 30% of sales derived from government customers, and the company did not discuss contingency plans for reduced defense funding, leaving investors exposed to a binary outcome if political or fiscal headwinds emerge in the U.S. defense sector.
The announced wind-down of the Legacy Commercial Programs segment, while strategically sound, carries execution risk, as the process is expected to take three to four years and may involve unforeseen liabilities, asset impairment charges, or slower-than-anticipated redeployment of talent, with the segment currently generating only $5.0 million in adjusted operating income on $252.4 million in sales, suggesting that the wind-down may not yield the expected margin improvement if asset divestitures do not generate meaningful gains or if redeployed employees fail to contribute effectively to higher-growth initiatives, potentially resulting in a prolonged drag on profitability during the transition period.