Canadian Airport Codes
Why do most of them begin with Y?
It has to do with the transition from two-letter to three-letter codes.
Originally, airport codes were just two-letters. In Canada, they decided to use the same code as the Morse code for the corresponding Canadian railway station.
Eventually, it became important to know if an airport had a weather station on-site. Airports with a station prefixed “Y” to their two-letter abbreviation, for “yes.”
When the world switched from two-letter to three-letter codes in the 1930s, Canada simply retained the codes that had been established.
Why I Looked It Up
I just always wondered.