One modified SM.75 set a closed-circuit endurance record of  in August 1, 1939, beating the then standing British record of  set with a Vickers Wellesley late in 1938.
On August 1, 1939, one modified SM.75 achieved an extended flight duration that broke the existing British record for similar aircraft flown with a Vickers Wellesley during the latter part of 1938.