The Corse began as the S.O.90 Cassiopée, a nine-passenger aircraft. The S.O.93 Corse and S.O.94 Corse II prototypes were developed as the S.O.95 Corse III. The aircraft was a cantilever mid-wing monoplane, powered by two Renault 12S engines with a retractable conventional landing gear. Seating up to 13 passengers, the seats could be quickly removed in order to carry more cargo. Intended to serve Air France, it failed their aircraft requirements. 60 aircraft were built for Aeronavale, and a small number for other overseas airlines.