What is the difference between YYZ and YTZ?
What is the difference between YYZ and YTZ? YZ was the code for the station in Malton, Ontario, where Pearson Airport is located and hence the IATA code for Pearson Airport is YYZ. The telegraph station in Toronto itself was coded TZ, which is why Toronto's smaller Billy Bishop Airport is coded YTZ.
Why is Montreal called Yul?
Codes beginning with Y were reserved for Canada and, in the case of Montréal-Trudeau, the remaining two letters – U and L – correspond to the frequency emitted by the radio beacon in Kirkland, near Dorval. Thus, the code indicates that the airport is in Canada, near the Kirkland beacon.