The Concorde was developed by the United Kingdom and France as part of the first major cooperative aircraft design venture between two European countries. In 1962 the U.K. and France signed a treaty to share costs and risks in the aircraft’s production. The Concorde was designed by four companies: in the U.K., British Aerospace and Rolls-Royce; and in France, Aérospatiale and SNECMA (Société Nationale d’Étude et de Construction de Moteurs d’Aviation). The final product was completed in 1969.