(C) YYZ – Toronto Pearson International Airport As for the 'YZ' part, that dates all the way back to the Morse Code railway stations along the Canadian National Railway, which had two-letter identifiers. The code for the station in Malton, Ontario, was YZ, which is where Pearson sits today—hence YYZ.

The code YYZ for Toronto Pearson International Airport is a relic of 1930s radio and railway history. In the early days of Canadian aviation, two-letter Morse code identifiers were used to identify weather stations near municipal airports. The code for the station in Malton, Ontario (where the airport is located) was YZ. When the IATA (International Air Transport Association) standardized three-letter codes, Canada added a "Y" (standing for "Yes") to indicate the presence of a co-located weather reporting station. Thus, "Y" plus "YZ" became YYZ. While many world airports use intuitive abbreviations like LAX or JFK, Canada's adherence to this historical "Y" prefix system—originally linked to the Canadian National Railway telegraphy—makes its airport codes uniquely distinct and a point of national pride for aviation enthusiasts.