The company operates through three business segments, namely Commercial Aviation, Defense and Security Business, and Executive Aviation. The Commercial Aviation segment focuses on the development, production, and sale of commercial jets, with an emphasis on the regional aviation industry and aircraft leasing. The Defense and Security Business segment is mainly involved in the research, development, production, and modification of defense aircraft, systems, and software design. Through the Executive Aviation segment, Embraer develops, produces, and sells business jets, provides support services related to this sector of the market, and aircraft leasing. The company has subsidiaries, affiliated companies, and representative offices in several countries. Embraer has delivered more than 8,000 aircraft since its founding in 1969 and generates the most revenue from its Commercial Aviation segment.