First flown on 2 March 1953, the first prototype of a series of mixed-power supersonic aircraft intended as interceptors. Around twelve were built, but the program was cancelled in July 1957 despite promising performance being achieved. Only the one aircraft was preserved, displayed at the Musee de l'Air since 1956.

The SNCASO Trident was a French mixed-propulsion interceptor built during the 1950s. It was powered by a single SEPR rocket engine, which was augmented by wingtip-mounted turbojet engines. This is the first of two prototype Trident I's built. Three prototypes and six pre-production Trident II were ordered and an fourth incomplete, pre-production Trident III was also produced. Only six of these nine Trident IIs were ultimately completed, of which all three prototypes were damaged or destroyed in accidents before the programme was cancelled in 1958 despite their record-setting performance.

The Trident had three engines of course, the primary powerplant being a rocket motor in the tail.

The Trident was intended to serve as an interceptor with the French Air Force, first flying in 1953. It was powered by a rocket engine plus two Mabore turbojets at the wing tips. Seen on display at the Chalais Meudon near Paris, it later moved to the museum at Le Bourget. The preserved Farman Goliath F-HMFU is suspended from the roof.