What is the significance of the "C" in ICAO code for an international airport?

The "C" in the ICAO code signifies the country of origin of the airport. The International Civil Aviation Organization (ICAO) assigns four-letter alphanumeric codes to airports worldwide, where the first letter often represents a specific geographical region or country. For example, in ICAO codes, "C" is used for various regions, including Canada. This system helps standardize airport identifiers globally, allowing pilots and air traffic controllers to easily recognize the specific locations of airports.

Understanding the structure of ICAO codes is crucial for navigation and communication in aviation, ensuring clarity when referring to specific airports and their locations worldwide.