ICAO airport code
The ICAO (//, eye-KAY-oh) airport code or location indicator is a four-letter code designating aerodromes around the world. These codes, as defined by the International Civil Aviation Organization and published in ICAO Document 7910: Location Indicators, are used by air traffic control and airline operations such as flight planning.
ICAO codes are also used to identify other aviation facilities such as weather stations, international flight service stations or area control centres, whether or not they are located at airports. Flight information regions are also identified by a unique ICAO-code.
The International Civil Aviation Organization was formed in 1947 under the auspices of the United Nations, and it established flight information regions (FIRs) for controlling air traffic and making airport identification simple and clear.
ICAO codes versus IATA codes
ICAO codes are separate and different from IATA codes, which are generally used for airline timetables, reservations, and baggage tags. For example, the IATA code for London's Heathrow Airport is LHR and its ICAO code is EGLL. ICAO codes are commonly seen by passengers and the general public on flight-tracking services such as FlightAware.
In general IATA codes are usually derived from the name of the airport or the city it serves, while ICAO codes are distributed by region and country. Far more aerodromes (in the broad sense) have ICAO codes than IATA codes, which are sometimes assigned to railway stations as well. Selection of ICAO codes is partly delegated to authorities in each country, while IATA codes which have no geographic structure must be decided centrally by IATA.
Unlike the IATA codes, the ICAO codes generally have a regional structure and are comprehensive. In general, the first letter is allocated by continent and represents a country or group of countries within that continent. The second letter generally represents a country within that region, and the remaining two are used to identify each airport. The exception to this rule is larger countries that have single-letter country codes, where the remaining three letters identify the airport. In either case, and unlike IATA codes, ICAO codes generally provide geographical context. For example, if one knows that the ICAO code for Heathrow is EGLL, then one can deduce that the airport EGGP is somewhere in the UK (it is Liverpool John Lennon Airport). On the other hand, knowing that the IATA code for Heathrow is LHR does not enable one to deduce the location of the airport LHV with any greater certainty (it is William T. Piper Memorial Airport in Lock Haven, Pennsylvania in the United States).
There are a few exceptions to the regional structure of the ICAO code made for political or administrative reasons. For example, the RAF Mount Pleasant air base in the Falkland Islands is assigned the ICAO code EGYP as though it were in the United Kingdom, but nearby civilian Port Stanley Airport is assigned SFAL, consistent with South America. Similarly Saint Pierre and Miquelon is controlled by France, and airports there are assigned LFxx as though they were in Europe. Further, in region L (Southern Europe), all available 2-letter prefixes have been exhausted and thus no additional countries can be added. Thus when Kosovo declared independence, there was no space in the Lxxx codes to accommodate it, so airports in Kosovo were assigned BKxx, grouping Kosovo with Greenland and Iceland.
The letters I and X are not currently used as the first letter of any ICAO identifier, and the letter J is only used in a ceremonial ICAO identifier granted to Jezero Crater on the planet Mars, JZRO. In Russia and the CIS, Latin letter X (or its Morse/Baudot Cyrillic equivalent Ь) is used to designate government, military and experimental aviation airfields in internal airfield codes similar in structure and purpose to ICAO codes but not used internationally. Q is reserved for international radiocommunications and other non-geographical special uses (see Q code).
In the contiguous United States and Canada and for some airports in Mexico, most, but not all, airports have been assigned three-letter IATA codes. These are the same as their ICAO code, but without the leading K, C, or M.; e.g., YEG and CYEG both refer to Edmonton International Airport, Edmonton, Alberta; IAD and KIAD are used for Washington Dulles International Airport, Chantilly, Virginia; and MEX and MMEX were originally used for Mexico City International Airport, Mexico City, Distrito Federal (the latter code would be replaced with MMMX after the airport opened). These codes are not to be confused with radio or television call signs, even though both countries use four-letter call signs starting with those letters. However, because Alaska, Hawaii, and United States territories have their own 2-letter ICAO prefix (i.e. "PA" for Alaska, "PH" for Hawaii"), the situation there is similar to other smaller countries and the ICAO code of their airports is typically different from its corresponding 3-letter FAA/IATA identifier. For example, Kona International Airport (PHKO vs KOA) and Juneau International Airport (PAJN vs JNU). Notably, the ICAO code of the largest gateway to Hawaii, Daniel K. Inouye International Airport, also known by its former name, Honolulu International Airport, contains the IATA identifier PHNL (IATA: HNL), while Anchorage International Airport's ICAO code does the same: PANC (IATA: ANC).
ZZZZ is a pseudo-code, used in flight plans for aerodromes with no ICAO code assigned.
A list of airports, sorted by ICAO code, is available below.
In small countries like Belgium or the Netherlands, almost all aerodromes have an ICAO code. For bigger countries like the UK or Germany this is not feasible, given the limited number of letter codes. Some countries have addressed this issue by introducing a scheme of sub-ICAO aerodrome codes; France, for example, assigns pseudo-ICAO codes in the style LFddnn, where dd indicates the department while nn is a sequential counter. In the case of France, an amateur organisation, the FFPLUM (Fédération Française des Planeurs Ultra Légers, the "French Federation of Ultralight Motorized Gliders"), was formally named the keeper of these codes. In Antarctica many aerodromes have pseudo ICAO-codes with AT and two digits, while others have proper codes from base owner countries such as NZ for New Zealand.
- ICAO Location Indicators(DOC7910) Publications Purchasing (official site)
- ICAO Aviation Data Service (official site)
- World Airport and Runway Map (official site)
- International Civil Aviation Organization (official site)
- Airport IATA/ICAO Designator / Code Database Search (from Aviation Codes Central Web Site – Regular Updates)
- "Airport ABCs: An Explanation of Airport Identifier Codes" . Air Line Pilot. Air Line Pilots Association. December 1994.
Information as of: 16.08.2021 04:49:40 CEST
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