ICAO airport code

ICAO CodeICAOlocation indicatorInternational Civil Aviation Organization airport codeairport codeInternational Civil Aviation Organization (ICAO) airport codecodeICAO location indicatorICAO:4-letter airport codes
The ICAO airport code or location indicator is a four-letter code designating aerodromes around the world.wikipedia
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International Civil Aviation Organization

ICAOICAO recommendations on use of the International System of UnitsInternational Civil Aviation Organization (ICAO)
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. 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 uses 4-letter airport codes (vs.

List of airports by ICAO code: K

KK – Contiguous United States
The ICAO codes for these airports are usually the FAA location identifier prefixed with a K. IATA codes are listed where applicable.

IATA airport code

IATA CodeIATAInternational Air Transport Association (IATA) airport code
ICAO codes are separate and different from IATA codes, which are generally used for airline timetables, reservations, and baggage tags.

Geocode

hierarchical administrative subdivision codesgeocode systemGeographical code

List of airports by IATA and ICAO code

List of airports by IATA codeCity Code IATA linkIATA airport codes
This is a list of airports by IATA code and ICAO code.

Code

encodingencodedencode
The ICAO airport code or location indicator is a four-letter code designating aerodromes around the world.

Air traffic control

control towerATCair traffic control tower
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.

Flight planning

3D flight planningFAA reserveflight plan
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.

Weather station

meteorological stationweather stationspersonal weather stations
ICAO codes are also used to identify other aviation facilities such as weather stations, International Flight Service Stations or Area Control Centers, whether or not they are located at airports.

Flight service station

FSSAutomated Flight Service StationAutomated Flight Service Station (AFSS)
ICAO codes are also used to identify other aviation facilities such as weather stations, International Flight Service Stations or Area Control Centers, whether or not they are located at airports.

Area control center

ARTCCAir Route Traffic Control CenterArea Control Centre
ICAO codes are also used to identify other aviation facilities such as weather stations, International Flight Service Stations or Area Control Centers, whether or not they are located at airports.

United Nations

UNU.N.the United Nations
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.

Flight information region

FIRFIRsflight information region (FIR)
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. Flight information regions are also identified by a unique ICAO-code.

North America

NorthNorth AmericanNA
Code selections in North America were based on existing radio station identifiers.

Call sign

call letterscallsigncall signs
Code selections in North America were based on existing radio station identifiers.

Mnemonic

mnemonicsmnemonic devicemnemonic aid
The United States had many pre-existing airports with established mnemonic codes.

Soviet Union

SovietUSSRSoviets
Thus Uxxx referred to the Soviet Union with the second letter denoting the specific region within it, and so forth.

Europe

EuropeanEUEuropean continent
Europe had too many locations for only one starting letter, so it was split into Exxx for northern Europe and Lxxx for southern Europe.

West Germany

West GermanFederal Republic of GermanyGermany
The second letter was more specific: EGxx was the United Kingdom (G for Great Britain), EDxx was West Germany (D for Deutschland), ETxx was East Germany (the ETxx code was reassigned to military fields after the reunification), LExx was Spain (E for España), LAxx was Albania, and so on.

East Germany

East GermanGerman Democratic RepublicGDR
The second letter was more specific: EGxx was the United Kingdom (G for Great Britain), EDxx was West Germany (D for Deutschland), ETxx was East Germany (the ETxx code was reassigned to military fields after the reunification), LExx was Spain (E for España), LAxx was Albania, and so on.

Finland

FinnishFINRepublic of Finland
France was designated LFxx, as the counterpart EFxx was the unambiguously northern Finland.

Airline timetable

scheduledtimetablesSchedule
ICAO codes are separate and different from IATA codes, which are generally used for airline timetables, reservations, and baggage tags.

Baggage

luggageleft luggagecarry-on baggage
ICAO codes are separate and different from IATA codes, which are generally used for airline timetables, reservations, and baggage tags.