SNCASO (Société nationale des constructions aéronautiques du sud-ouest, or commonly, Sud-Ouest) was a French aircraft manufacturer, which originated on November 16, 1936, from the merger of the factories of Blériot of Suresnes, Bloch of Villacoublay and Courbevoie, SASO (Société Aéronautique du Sud-Ouest) of Bordeaux-Mérignac, UCA (Usine de Construction Aéronautique) of Bordeaux-Bègles, SAB (Société Aérienne Bordelaise) of Bordeaux-Bacalan and Lioré et Olivier of Rochefort. Additionally, SNCASO built a factory in Déols in 1936.
SNCASO took over SNCAO's assets in 1941.
On March 1, 1957, SNCASO merged with SNCASE (Société nationale de constructions aéronautiques du sud-est), to form Sud Aviation.
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