In 1984 Air Atonobee was acquired by former Nordair vice president Victor Papallardo. The airline was re-branded as City Express. As new DHC-8 and Dash 7s were delivered, the airline started replacing their ST-27s. C-FXOK, the second ST-27 converted, is pictured withdrawn from service and still in Air Atonobee colors. It was scrapped in 1991 after City Express stopped flying in February.

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 The aircraft was withdrawn circa 1988 and cancelled from the Canadian register January 3, 1991.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.

Registration cancelled in 1989