Which city is represented by the designator code YOW?

The designator code YOW is specifically assigned to Ottawa Macdonald-Cartier International Airport, located in Ottawa, Ontario. Each airport in Canada is assigned a unique three-letter code based on the IATA (International Air Transport Association) system, and YOW is recognized as the official code for this airport.

This code helps in identifying the airport in various aviation-related contexts, including ticketing, baggage handling, and flight schedules. It's important to note that this coding system does not directly correlate with the names of the cities; rather, it is based on geographic location and airport identifiers. In this instance, YOW clearly identifies Ottawa, ON, thus making it the correct choice.