In August that year, Hélène Boucher set an airspeed record for aircraft in its class with the C.450, of 455 km/h (284 mph) and on Christmas Day, Raymond Delmotte set a new landplane world airspeed record of 506 km/h (314 mph) in a C.460, although the absolute airspeed record was still held by a seaplane.
The C.450 won the Coupe Deutsch de la Meurthe again in 1935, this time piloted by Yves Lacombe. It was joined in the race by two C.461s, a highly-modified version of the C.460 with the cockpit sunk entirely within the fuselage. Forward vision for the pilot was provided via two glazed-over scallops in the fuselage sides. One of these aircraft, flown by Maurice Arnoux, placed second in the race. A C.460 piloted by Michel Detroyat also won the Greve Trophy and Thompson Trophy at the 1936 National Air Races in the United States.