Billy Bishop Toronto City Airport (IATA: YTZ, ICAO: CYTZ), commonly known as the Toronto Island Airport is an airport located on the Toronto Islands in Toronto, Ontario, Canada. It is named after Air Marshal Billy Bishop, a Canadian First World War flying ace. As of 2010, it was Canada's 14th busiest airport and Ontario's 3rd busiest airport by passengers and the 17th busiest Canadian airport in terms of aircraft movements. The airport is used by civil aviation, air ambulances, and regional airlines using turboprop planes.
Opened in 1939, it has been operated since 2000 by the Toronto Port Authority (TPA). Since 2000, the airport has been a centre of controversy between community groups and Toronto politicians wishing to close the airport and the TPA and its primary tenant, Porter Airlines, who have expanded its usage.