High Quality Content by WIKIPEDIA articles! Downsview Airport or Toronto/Downsview Airport, (IATA: YZD, ICAO: CYZD), is located in Toronto, Ontario and has been exclusively owned and used as a testing facility by Bombardier Aerospace since 1994. Downsview Airport has its own fire service (Bombardier Aerospace Emergency Services) which covers airport operations (using two airport fire rescue vehicles) and plant operations (using two SUV emergency vehicles). Bombardier Emergency Services employees are cross-trained as firefighters, first responders and airport security.