What is the airport code shared for both Calgary and Edmonton?

The shared airport code for Calgary is YYC, while Edmonton has a different code, YEG. In Canada, airport codes are often based on a standard three-letter format that typically incorporates the letters "Y" and reflects the geographical region. YYC specifically indicates Calgary International Airport, thus making it the correct answer for the question about the airport code associated with Calgary.

The other choices represent different airports: YYG is the code for Charlottetown Airport, and YMM is used for Fort McMurray Airport. YEG pertains to Edmonton International Airport. Each of these codes corresponds to a distinct location, confirming why YYC is the right choice for Calgary.