Owais Crawford
Every airport in the world has a unique code that identifies it. These codes are called ICAO codes, named after the International Civil Aviation Organization, which was founded in 1947 and is based on the United Nations. ICAO codes are four-letter codes that are used globally in flight operations and air traffic control. They are concise and unambiguous, allowing for more than 450,000 unique combinations, and are an essential tool for pilots, air traffic control, and aviation authorities.
| Characteristics | Values |
|---|---|
| Definition | A four-letter code designating aerodromes around the world |
| Usage | Used by air traffic control and airline operations such as flight planning |
| Other uses | Identifying aviation facilities such as weather stations, international flight service stations, or area control centers |
| Code composition | The first one or two letters indicate the country, and the remaining letters identify the airport |
| Examples | Heathrow International Airport in London has the ICAO code EGLL, with EG reflecting that it is based in the United Kingdom |
| Updates | ICAO codes are sometimes updated when an airport is renamed or when it has both civilian and military users |
| Non-airport usage | Codes beginning with I (Ixx and Ixxx) are used for navigational aids such as radio beacons, and the Q code is reserved for international radiocommunications |
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What You'll Learn
- ICAO codes are four-letter codes designating aerodromes worldwide
- They are defined by the International Civil Aviation Organization
- ICAO codes are separate from three-letter IATA codes
- The first one or two letters of the ICAO code indicate the country
- Some airports have two ICAO codes, usually when shared by civilian and military users
ICAO codes are four-letter codes designating aerodromes worldwide
ICAO codes, or location indicators, are four-letter codes that designate aerodromes around the world. They are defined by the International Civil Aviation Organization and published quarterly in ICAO Document 7910: Location Indicators. ICAO codes are used by air traffic control and airline operations for flight planning. They are also used to identify other aviation facilities such as weather stations, international flight service stations, or area control centres, regardless of whether they are located at airports. Flight information regions are also identified by unique ICAO codes.
The first one or two letters of the ICAO code indicate the country, while the remaining letters identify the airport. For example, the ICAO code for Heathrow International Airport in London is EGLL, with "EG" reflecting that it is based in the United Kingdom. If one knows that the ICAO code for Heathrow is EGLL, then one can deduce that the airport EGGP is somewhere in the UK (Liverpool John Lennon Airport). In contrast, IATA codes, which are generally used for airline timetables, reservations, and baggage tags, do not provide geographic reference. For example, LHR, representing Heathrow, does not enable one to deduce the location of the airport LHV with any greater certainty.
ICAO codes are distributed by region and country, and the selection of ICAO codes is partly delegated to the authorities in each country. In small countries like Belgium or the Netherlands, almost all aerodromes have an ICAO code. For larger countries like the UK or Germany, it is not feasible to assign ICAO codes to all aerodromes due to 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.
ICAO codes are sometimes updated, such as when Johannesburg Airport in Johannesburg, South Africa, was renamed from Jan Smuts International Airport (code FAJS) to O. R. Tambo International Airport (code FAOR). Some airports have two ICAO codes, usually when an airport is shared by civilian and military users. For example, Frankfurt Airport in Frankfurt, Germany, has been assigned ICAO code EDDF, while the now-closed Rhein-Main Air Base was assigned ICAO code EDAF.
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They are defined by the International Civil Aviation Organization
ICAO airport codes are four-letter codes that designate aerodromes and other aviation facilities worldwide. These codes are defined by the International Civil Aviation Organization (ICAO) and are published quarterly in the ICAO Document 7910: Location Indicators. They are used by air traffic control and airline operations for flight planning and other purposes.
The first one or two letters of the ICAO code indicate the country, while the remaining letters identify the airport. For example, the ICAO code for Heathrow International Airport in London is EGLL, with "EG" reflecting that it is based in the United Kingdom. ICAO codes are separate and different from the three-letter IATA codes, which are generally used for airline timetables, reservations, and baggage tags.
ICAO codes are sometimes updated when an airport is renamed or when an airport is shared by civilian and military users. For instance, Johannesburg Airport in Johannesburg, South Africa, was formerly known as Jan Smuts International Airport with the code FAJS. When the airport was renamed O. R. Tambo International Airport, its ICAO code was updated to FAOR. Frankfurt Airport in Frankfurt, Germany, has the ICAO code EDDF, while the now-closed Rhein-Main Air Base was assigned the code EDAF.
In some countries, such as Australia, the second letter of the ICAO code is usually linked to the airport's FIR (Flight Information Region). However, this is not always the case, as Sydney's FIR has been non-existent since the introduction of TAAATS. In the contiguous United States and Canada, many airport ICAO codes are simply copies of their IATA codes with a geographical prefix added.
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ICAO codes are separate from three-letter IATA codes
ICAO codes are four-letter codes that are separate from the three-letter IATA codes. They are defined by the International Civil Aviation Organization and are used to designate aerodromes and aviation facilities worldwide. ICAO codes are used in flight operations and air traffic control, whereas IATA codes are used for airline travel-related purposes such as schedules, bookings, ticketing, and baggage tags.
ICAO codes are distributed by region and country, with the first one or two letters indicating the country, while the remaining letters identify the airport. For example, the ICAO code for Heathrow Airport in London is EGLL, with "EG" indicating that it is based in the United Kingdom. In contrast, IATA codes are derived from the name of the airport or the city it serves and do not provide a geographic reference. For instance, the IATA code for Heathrow Airport is LHR, which does not directly indicate the location of the airport.
While ICAO codes are used internationally for interoperability between air navigation service providers, IATA codes are specific to the airline travel industry. ICAO codes are assigned to locations beyond airports, including air traffic control facilities and weather stations, whereas IATA codes are assigned to airports with regular passenger and cargo services. Additionally, some non-airport locations connected to air travel, such as train and bus stations, may also have IATA codes.
In some cases, airports may have both ICAO and IATA codes. For example, Edmonton International Airport in Canada has the IATA code YEG and the ICAO code CYEG. However, this similarity between IATA and ICAO codes is not consistent across all regions. For instance, Kahului Airport on Maui has an IATA code of OGG and an ICAO code of PHOG.
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The first one or two letters of the ICAO code indicate the country
The International Civil Aviation Organization (ICAO) defines ICAO airport codes, which are four-letter codes designating aerodromes worldwide. These codes are used by air traffic control and airline operations for flight planning and other purposes.
In some cases, the third letter of the ICAO code may be used to identify the Flight Information Region (FIR) in which an airport is located, while the last character identifies the airport itself. For instance, the ICAO code for Charles de Gaulle Airport in Paris, France, is LFPG, with L for Southern Europe, F for France, P for Paris FIR, and G for the airport.
The selection of ICAO codes is partly delegated to the authorities in each country. In small countries like Belgium and the Netherlands, almost all aerodromes have an ICAO code. In larger countries like the UK and Germany, it is not feasible to assign a unique ICAO code to every aerodrome due to the limited number of letter combinations available. To address this issue, some countries have introduced sub-ICAO aerodrome codes. For example, France uses pseudo ICAO codes in the format LFddnn, where dd indicates the department and nn is a sequential counter.
ICAO codes are separate from three-letter IATA codes, which are generally used for airline timetables, reservations, and baggage tags. While IATA codes are derived from the name of the airport or the city it serves, ICAO codes are distributed by region and country.
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Some airports have two ICAO codes, usually when shared by civilian and military users
The ICAO airport code is a four-letter code designating aerodromes around the world. These codes are defined by the International Civil Aviation Organization and are published quarterly in ICAO Document 7910: Location Indicators. They are used by pilots, air traffic control, and airline operations such as flight planning. The first letter of the ICAO code denotes the general geographic region of the airport. For example, E is for Northern Europe, S for South America, and C for Canada. The second letter narrows it down to the country. The remaining two letters identify the specific airport.
Some airports have two ICAO codes, usually when an airport is shared by civilian and military users. Frankfurt Airport in Frankfurt, Germany, for instance, has been assigned the ICAO code EDDF, while the now-closed Rhein-Main Air Base was assigned ICAO code EDAF. Sion Airport in Switzerland has the code LSGS, while its military facilities have the ICAO code LSMS. Brussels Airport in Brussels, Belgium, has the ICAO code EBBR for its civilian facilities, and Melsbroek Air Base has been assigned ICAO code EBMB. Despite the two airports sharing runways and ground and air control facilities, they have different ICAO codes.
ICAO codes are separate and different from the three-letter IATA codes, which are generally used for airline timetables, reservations, and baggage tags. In some cases, the IATA code is derived from the name of the airport or the city it serves. For example, the IATA code for London's Heathrow Airport is LHR, and its ICAO code is EGLL, with EG indicating that it is based in the United Kingdom. However, IATA codes do not always match the city's name and may have historical reasons behind their naming. For example, Orlando International Airport's IATA code is MCO because the airfield was previously called McCoy Air Force Base.
ICAO codes are particularly useful for international flights and flights flown under Instrument Flight Rules (IFR). They offer stability and consistency, even when airports or cities change names. These codes also help overcome language barriers and difficulties with complex airport names, reducing potential errors and misunderstandings in critical flight data.
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Frequently asked questions
ICAO stands for International Civil Aviation Organization.
ICAO codes are four-letter codes that are distributed by region and country. The first one or two letters indicate the country, while the remaining letters identify the airport. IATA codes, on the other hand, are three-letter codes with no geographic structure.
Yes, some airports have two ICAO codes, usually when the airport is shared by both civilian and military users. For example, Frankfurt Airport in Germany has the ICAO code EDDF, while the Rhein-Main Air Base was assigned the ICAO code EDAF until its closure.
