Heico is an aerospace and defense supplier that focuses on creating niche replacement parts for commercial aircraft and components for defense products. In commercial aerospace, Heico is the largest independent producer of replacement aircraft parts, primarily for engines. In the defense market, the company produces niche subcomponents used in targeting technology as well as simulation equipment, among other things. It operates as two segments: the flight support group,or FSG, and the electronic technologies group, or ETG, both of which supply the aerospace and def