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| | Encyclopedia: ICAO airport code |
 | | The International Civil Aviation Organization (ICAO), an agency of the United Nations, develops the principles and techniques of international air navigation and fosters the planning and development of international air transport to ensure safe and orderly growth. |
 | | In the United States and Canada, most airports which have been assigned three-letter IATA codes use the same code with leading "K" or "C" as their ICAO code (or P, in the case of Alaska and Hawaii); e.g., YYC (Calgary International Airport, Calgary, Alberta) and CYYC, IAD (Dulles International Airport, Chantilly, Virginia) and KIAD. |
 | | Calgary International Airport (IATA: YYC, ICAO: CYYC) is a medium-sized airport that serves Calgary, Alberta, Canada and the surrounding region. |
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