Report Highlights

Aircraft Engine MRO in the U.S.: Market Overview

The U.S. aircraft engine MRO market was valued at USD 11.8 billion in 2024 and is organized into three tiers: OEM-authorized shops run by GE Aerospace and Pratt & Whitney, airline technical operations at Delta TechOps and American Airlines TechOps, and independent Part 145 repair stations. Federal certification under 14 CFR Part 145 created the framework that lets independents such as StandardAero and AAR compete for heavy engine work.

Government has been the dominant force in setting demand and certifying capacity, while private capital has led shop investment. FAA airworthiness directives issued under 14 CFR Part 39 force engine removals on fixed schedules, creating demand that operators cannot defer. Defense sustainment at Tinker Air Force Base, governed by 10 U.S.C. 2466, anchors military volume, whereas test cell, borescope and module capacity has been financed almost entirely by private operators and OEMs.

Policy-Driven Growth in U.S. Engine Maintenance

The FAA Reauthorization Act of 2018 (Public Law 115-254) set the oversight framework for Part 145 repair stations and certification staffing, which governs how quickly new shop capacity enters service. Airworthiness directives issued under 14 CFR Part 39 convert directly into shop visits: each mandated inspection or life-limit change removes engines from the wing and lifts throughput across the installed fleet.

The EPA's greenhouse gas standard for aircraft engines, finalized in 2021 under Section 231 of the Clean Air Act and codified at 40 CFR Part 1031, aligns U.S. rules with ICAO CO2 standards and tightens thresholds for newly certificated engine types. Operators keeping in-service CFM56 and V2500 fleets rather than absorbing newer compliance costs sustain demand for life-extension overhauls, which independent shops perform on a steady volume basis.

Regulatory Barriers and Compliance Costs

Repair station certification under 14 CFR Part 145 is administered by FAA Flight Standards District Offices and requires approval of a capability list, facilities manual and training program. A new large-engine facility typically needs 12 to 24 months before its first commercial release, and each added engine model requires a separate capability list amendment, so certification delay becomes a direct revenue constraint.

Defense work faces two domestic-content regimes. Under 10 U.S.C. 2466, administered by the Department of Defense and Air Force Materiel Command, no more than 50 percent of depot-level maintenance funds may go to contractors, forcing partnerships with organic depots. The Berry Amendment under 10 U.S.C. 4862 requires domestically melted specialty metals in engine components, and non-compliant suppliers are excluded from award eligibility, with sourcing documented part by part.

Policy-Created Opportunities in the U.S.

The Department of Energy and FAA's Sustainable Aviation Fuel Grand Challenge targets 3 billion gallons of SAF annually by 2030, and the clean fuel production credit under Section 45Z of the Internal Revenue Code, extended through 2029 by the 2025 reconciliation act, rewards blending. Higher SAF blends require fuel system compatibility inspections, seal replacements and combustor checks, creating a defined overhaul scope that independent shops can price and certify.

Military sustainment offers a procurement-led opportunity. Pratt & Whitney's F135 Engine Core Upgrade for the F-35 fleet is funded through Air Force contracting, and Defense Logistics Agency performance-based logistics agreements reward guaranteed turnaround. Shops holding both Part 145 certification and DoD depot qualification will capture work currently constrained by organic depot capacity limits.

Market at a Glance

Leading Market Participants

• GE Aerospace
• Pratt & Whitney
• StandardAero
• AAR Corp
• Lufthansa Technik
• Delta TechOps
• American Airlines TechOps
• Honeywell Aerospace
• MTU Maintenance
• Safran Aircraft Engines

Regulatory and Policy Environment

The primary legislation is the Federal Aviation Act of 1958, as amended, with repair station rules codified at 14 CFR Part 145 and airworthiness directive authority at 14 CFR Part 39. Part 145 requires a quality control system under 14 CFR 145.211, an approved training program, and recurring oversight by FAA Flight Standards District Offices. The FAA Reauthorization Act of 2024 (Public Law 118-63) extended FAA programs through fiscal 2028, setting the next major review window for repair station oversight.

Upcoming changes include CORSIA, ICAO's market-based offset scheme, which becomes mandatory in 2027 for participating states, including the United States, making engine efficiency records a compliance input. Compared with the European Union, where Part-145 approvals under Commission Regulation (EU) No 1321/2014 are issued by national authorities under EASA oversight, the FAA approves U.S. shops directly, giving domestic capacity a single-agency pathway. The U.S.-EU Bilateral Aviation Safety Agreement of 2011 enables mutual acceptance of certificates.

Long-Term Policy Outlook for U.S. Engine MRO

The FAA's authorization expiry in fiscal 2028 will force Congress to revisit repair station oversight, with digital record requirements and inspection data standards at the center of that review. Engine MRO shops will need electronic traceability of every life-limited part, reshaping investment toward data infrastructure alongside test cell capacity by 2032.

Carbon policy will reshape the work mix. CORSIA's 2027 mandate and the Section 45Z credit through 2029 push operators toward efficiency-driven overhauls and retrofits, while EPA aircraft standards keep new-type engines under tighter emission thresholds. Shops combining Part 145 authority with SAF-compatible fuel system expertise will capture the largest share of growth as the market reaches USD 16.9 billion in 2032.