Your Trusted Partner
for Asset Management
About Us
With a history spanning over 30 years, Willis Mitsui & Co. Asset Management Limited has developed vast knowledge and expertise across aircraft and engine markets, building a reputation as a trusted and independent partner in the aviation consultancy and asset management sector.
Over the decades, we have supported airlines, lessors, and financiers around the world, underpinned by a team of highly experienced consultants, drawn from a broad spectrum of industry backgrounds, who bring practical insight, strategic thinking, and deep technical understanding to every engagement.
Today, Willis Mitsui & Co. Asset Management Limited enters an exciting new chapter as part of Willis Mitsui & Co. Engine Support Limited – a joint venture between Willis Lease Finance Corporation (WLFC) and Mitsui & Co. This partnership strengthens our capabilities with the global reach, financial strength, and industry leadership of our parent companies, allowing us to deliver even greater value to our customers.
While our heritage is rooted in independence and decades of proven experience, this evolution ensures we remain at the forefront of an ever-changing aviation market, committed to helping our partners navigate opportunities and challenges with confidence.
Your Complete Aviation Services Provider
Our Knowledge
Originally launched as TES Aviation in 1995;
acquired by Willis Lease Finance Corporation in 2016; acquired by Willis Mitsui & Co. Engine Support Limited in 2025
Our Experience
Over 1,000,000 man-hours of projects successfully delivered
Our Team
Permanent technical consultants, delivery staff, and global contractor network
We are structured to support everything from ad-hoc engine maintenance requirements, to full aircraft transitions, and long-term fleet management programs, plus a host of other needs for airlines, lessors, and more.
Our Team
Our leadership team is driven by a deep commitment to our customers. With over 150 years of combined industry experience, we are seasoned experts at forging strong relationships and delivering world-class service in the aviation industry.
Our Services
Engine Technical & Consultancy Services
We combine decades of engine-asset experience and proprietary IP to provide independent consultancy and fleet-management support covering operator and lessor portfolios, MROs, and investors. Services span engine fleet planning, maintenance cost forecasting, contract negotiation, appraisals and valuations, technical inspections and records auditing, and engine delivery/redelivery project management. The aim is to help clients make informed, risk-aware decisions around engine asset ownership, operations and investment.
Aircraft Technical & Consultancy Services
We provides comprehensive technical support to aircraft owners, lessors, MROs and financiers, covering delivery/redelivery transitions, repossessions, inspections, and full aircraft fleet technical assessments. We also manage maintenance-check oversight, cargo conversion projects, and contract negotiations (including lease, purchase/sale, MRO, import/export and insurance claim support). Our goal is to safeguard asset value, mitigate asset risk and optimize operational and financial performance throughout the asset lifecycle.
Airworthiness Management (CAMO)
We offer Continuing Airworthiness Management for the full range of Boeing and Airbus aircraft, plus “shadow CAMO” and airworthiness monitoring services — including for aircraft entering or transitioning between regulatory jurisdictions (EASA, FAA, etc.).
We also provide a turnkey, custom-packaged support offering: from Airworthiness Review Certificate (ARC) maintenance, FAA DAR support, Part 21 modifications, to ferry/demo flights, maintenance-program planning, technical records management, condition monitoring, and compliance reporting.
Quality & Regulatory Services
We offers a broad range of quality-and-regulatory support designed for aviation and MRO organizations. Their services include MRO best-practice assessments, regulatory-compliance audits, and assistance with Air Operator Certificate (AOC) setup and ongoing compliance. We also perform airline technical-infrastructure reviews and root-cause quality investigations to help ensure safety, regulatory adherence, and operational reliability
Global Presence
Strategically positioned to meet customer needs around the world
Our Customers