Which designator code is assigned to Toronto City, Ontario?

The designator code assigned to Toronto City, Ontario, is YTZ. This code is specifically used for Billy Bishop Toronto City Airport, which is situated on an island near downtown Toronto. The use of "Y" as a prefix in the code indicates that it is a Canadian airport, as all Canadian airport codes begin with the letter "Y." The subsequent letters "TZ" are unique to this particular location and help to identify it among other airports in the region.

In contrast, the other choices represent different airports in Canada: YUL is the designator for Montréal-Pierre Elliott Trudeau International Airport in Montreal, YOW refers to Ottawa Macdonald-Cartier International Airport in Ottawa, and YQR is the designator for Regina International Airport in Regina, Saskatchewan. Recognizing these designator codes is essential for navigating air travel and understanding airport locations in Canada.