TransDigm Group, a large US-based aerospace parts manufacturer and supplier that focuses almost entirely on the aviation aftermarket, has agreed to acquire Jet Parts Engineering and Victor Sierra Aviation Holdings for approximately $2.2 billion in cash. The transaction was disclosed on January 16, 2026, and remains subject to regulatory approval.
Jet Parts Engineering, based in Seattle, designs and manufactures proprietary replacement parts and repair solutions for commercial, regional, and cargo airlines, as well as maintenance, repair and overhaul providers. Victor Sierra Aviation Holdings, headquartered in Baldwin City, Kansas, supplies aftermarket parts and services across commercial aerospace and the general and business aviation markets through a portfolio of brands that includes McFarlane Aviation, Tempest Aero Group, and Aviation Products Systems. Together, the two companies generated approximately $280 million in revenue in 2025.
TransDigm said the acquisition aligns with its focus on engineered, proprietary aerospace components and aftermarket solutions. Chief Executive Officer Mike Lisman said Jet Parts and Victor Sierra fit well with the company’s operating model and would continue serving customers under TransDigm ownership.
Both companies have been owned for several years by Vance Street Capital, a Los Angeles-based private equity firm that specializes in aerospace, defense, and industrial businesses. Vance Street acquired Jet Parts Engineering in 2017 and later formed Victor Sierra Aviation Holdings by assembling and growing a group of general and business aviation aftermarket brands. During its ownership, the businesses expanded their product portfolios and aftermarket reach, supported by sustained demand for replacement parts across multiple aviation segments.
The sale marks the end of Vance Street’s roughly eight-year investment cycle and follows a familiar private equity pattern: acquiring niche aerospace suppliers, investing in growth and operational scale, and exiting through a strategic buyer.
For aviation operators, parts suppliers, and maintenance providers, the deal highlights continued consolidation across the aerospace aftermarket. Demand for replacement parts, particularly Parts Manufacturer Approval and other proprietary components, has remained strong as airlines and operators extend aircraft service lives amid delivery delays and cost pressures. Victor Sierra’s footprint in general and business aviation makes the acquisition relevant beyond the airline sector, particularly for owners seeking alternatives to original equipment manufacturer parts. Jet Parts’ established relationships with major carriers and MROs further expand TransDigm’s reach across the commercial aftermarket.
Founded in 1993 by former General Electric and Boeing executives, TransDigm built its business around the aerospace aftermarket rather than aircraft manufacturing. The company has pursued a long-standing strategy of acquiring small, specialized manufacturers that produce highly engineered, certified aircraft components. Once approved and installed, those parts often remain on aircraft for decades, creating steady aftermarket demand. TransDigm went public in 2006 and has since expanded primarily through acquisitions, typically allowing acquired companies to continue operating under their existing brands.
Over time, TransDigm has become one of the most influential suppliers in the aerospace supply chain, serving commercial airlines, business aviation, helicopters, and military operators. While the company has faced scrutiny over pricing practices on some sole-source parts, it has continued to grow by focusing on aftermarket businesses with long product lifecycles and high certification barriers. The acquisition of Jet Parts Engineering and Victor Sierra follows a pattern that has defined TransDigm’s growth for more than three decades.
