Downsview Airport

This airport is in an ideal location, right in the middle of metro Toronto near the end of a subway line, but unfortunately it's not normally open to the public. It's a former military field, long used by Bombardier for flight testing. The closest public airports are Buttonville (YKZ) to the northeast, City Centre (YTZ) to the south (right by downtown), and the very busy and expensive Pearson (YYZ) to the west. Oshawa (YOO) and Brampton (CNC3) can also be useful for the extreme ends of Toronto.