In YYZ was it! Now some know and the rest of us haven't a clue
Yeah, some of us in Canada get a little puzzled, and have to refer to Google, with the use of four letter codes on the other side of the Atlantic.
All large Canadian airports have "Y" as the first of three characters, or "CY" as the first of four. Usually the last two characters seem random, though for some of the newer Canadian airports, there is some apparent logic. Apparently the seemingly random last two characters on the "original" airports originated with weather station designation at those locations - before my time!
YYZ was home base for me for years - back in the "Terminal 2" days!