What is the airport code for the city of Calgary?

The airport code for the city of Calgary is YYC. This code is derived from the International Civil Aviation Organization (ICAO) designator for Calgary International Airport, which is CYYC. The use of "YYC" follows the convention of Canadian airport codes that often utilize "Y" as the first letter. Calgary International Airport serves as a major hub for both domestic and international flights, and the code YYC is widely recognized in the travel industry.

The other options represent different airports: ORD is for O'Hare International Airport in Chicago, CLT is for Charlotte Douglas International Airport in North Carolina, and CHS is for Charleston International Airport in South Carolina. Each of these codes corresponds to a specific airport in a different city, making YYC the clear and accurate choice for Calgary.