Proponent (Kapco Valtec)

Proponent is the world’s largest independent aerospace distribution company. We are 100% employee owned, making our highest global priority to effectively serve you, our suppliers and customers. Our product portfolio consists of over 400,000 high quality aircraft parts, which we deliver on-time, anywhere in the world.

Proponent is a new identity with deep aerospace roots.

Avio-Diepen was founded in 1946 by Dutch aviation pioneer, Frits Diepen. Kapco Global was formed in 1972 under the name Kirkhill Aircraft Parts Company. Both companies have a stellar reputation for high quality parts, decades on reliable on-time delivery and outstanding customer-centered service. With 115 years of combined aerospace expertise, we have lots of stories to tell.