ICAO Codes
ICAO codes are four-letter alphanumeric code designators used by the International civil aviation organization (ICAO) to identify airports, area control centers, and weather observation stations worldwide. These codes are different from the IATA codes, which are used primarily by airlines and travel agents. ICAO codes are used by air traffic control and airline operations such as flight planning. They are not displayed to the general public and are more comprehensive than IATA codes, as they can include facilities that are not open to commercial flights. For example, the ICAO code for London Heathrow Airport is EGLL, while its IATA code is LHR. The first letter of the ICAO code indicates the geographical region of the airport, the second letter indicates the country, and the last two letters identify the airport itself. The ICAO also assigns three-letter codes to aircraft operators, known as airline designators.
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