Originally DH 114 heron G-AOZX, this aircraft flew for the Sultan of Morocco as CN-MAA when delivered in 1957. Acquired by Sauners Aircraft for conversion to ST-27 in 1975. Seen as 8P-GWP painted for Tropic Air Services Barbados January - May 1976, in June the aircraft was registered C-FHMQ to Otonabee Airways (In 1980 re-named Air Atonabee). Last with City Express (same airline, new name) from 1984, the aircraft was withdrawn in 1988.

Originally built in 1956 as a De Havilland Heron and on the German and Danish register before conversion to a ST-27 in 1971. Pictured in service with Air Atonabee, the airline was renamed CityExpress in 1984. The aircraft was withdrawn circa 1988 and cancelled from the Canadian register January 3, 1991.

The ST-27 was designed by the Canadian Saunders Aircraft Company as a conversion of the earlier de Havilland Heron.