He held this position until 23 December 1986. From 29 October 1986 to 4 April 2000, Serge Dassault has been Chairman and CEO of the company Avions Marcel Dassault - Breguet Aviation (which became Dassault Aviation in 1990) before becoming its Honorary Chairman. Since 2 December 1987, Serge Dassault had also been Chairman and CEO of Dassault Industries, which became the Groupe Industriel Marcel Dassault on 1 January 2000. Under his leadership, Dassault Aviation consistently developed and implemented a policy aimed at adapting to new market realities. He led the Company to rise to the challenges of the 21 st century.