Billy Bishop Toronto City Airport (IATA: YTZ, ICAO: CYTZ) is a small regional airport located on the Toronto Islands in Toronto, Ontario, Canada. The airport is often referred to as the Toronto Island Airport and was previously known as Port George VI Island Airport and Toronto City Centre Airport. The airport's name honours Billy Bishop, the Canadian World War I flying ace and World War II Air Marshal. It is used by civil aviation, air ambulances, and regional airlines using turboprop planes. In 2016, it was ranked Canada's ninth-busiest airport, Ontario's third-busiest airport by passenger numbers and the sixth-busiest Canadian airport that serves the U.S.