@b541bfe5 @2827a0a2 8 out of the 13 international airports in Canada seem to have 1 to 2 letters from the location initials/name in them so it's not TOTALLY random: YYC, YEG, YFC, YHZ, YOW, YQB, YVR, YWG for Calgary, Edmonton, Fredericton, Halifax, Ottawa, Quebec City, Vancouver, Winnipeg.