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Airport codes are used to identify airports and metropolitan areas around the world. These codes are typically three or four letters long and are assigned by IATA, ICAO, the FAA, and other civil aviation organizations. The use of airport codes began in the 1930s when pilots in the United States employed a two-letter code from the National Weather Service (NWS) for city identification. As the number of airports grew, a three-letter system was implemented to allow for more combinations. Today, some airport codes include numbers, especially for smaller airports that do not qualify for a three-letter identifier.
| Characteristics | Values |
|---|---|
| Airport codes | 3-letter or 4-letter codes |
| Airport code usage | Used for location identification, on baggage tags, and for tickets and luggage |
| Airport code assignment | Assigned by IATA, ICAO, the FAA, and other civil aviation organizations |
| Airport code history | Initially, pilots used a two-letter code from the National Weather Service for identifying cities |
| Airport code format | The letter may appear in the first, middle, or last position in the combination of three characters |
| ICAO airport code | A four-character alphanumeric code |
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What You'll Learn
Airport codes are three-letter geocodes
The three-letter system implemented by the International Air Transport Association (IATA) allows for a significantly larger number of permutations, making it possible to assign unique codes to airports around the world. These codes are used in various ways, such as on baggage tags and for reservations and logistics. The assignment of IATA codes is governed by IATA Resolution 763 and is administered by the organisation's headquarters in Montreal, Canada. The codes are published semi-annually in the IATA Airline Coding Directory.
While most airport codes are named after the first three letters of the city in which the airport is located, there are exceptions to this. For example, some airports serving cities with multiple airports may have codes derived from the airport's name, such as JFK for New York's John F. Kennedy International Airport. Additionally, due to the scarcity of codes, some airports are assigned letters not found in their names, such as DXB for Dubai, United Arab Emirates, and BHX for Birmingham Airport in the United Kingdom.
It's worth noting that some countries have unique patterns to their airport codes. For instance, many major Canadian airport codes start with the letter "Y," and New Zealand airports often use the letter "Z" to distinguish them from similar airport names in other countries, like ZQN for Queenstown.
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Codes are assigned by IATA, ICAO, FAA, and other aviation organisations
Airport codes are a convenient way to identify airports and locations. These codes are assigned by IATA, ICAO, FAA, and other civil aviation organisations.
IATA
IATA, or the International Air Transport Association, is a trade association that represents airlines. It provides 3-letter codes for airports and metropolitan areas worldwide. These codes are used for ticketing, travel itineraries, baggage tags, and cargo shipping. The IATA codes are the ones passengers are most familiar with, as they are used for passenger services.
ICAO
The ICAO, or the International Civil Aviation Organization, is a United Nations organisation that represents aviation authorities. It establishes 4-letter codes for airports, which are used for official purposes such as Air Traffic Control, flight plans, and airline flight identification. ICAO codes are commonly seen within the aviation industry and on private flight-tracking services.
FAA
The FAA, or the Federal Aviation Administration, is the civil aviation authority in the United States. It assigns Location Identifiers (LIDs) to airports within the country. FAA LIDs can be 3 or 4 letters long and are used in domestic flight operations. The FAA only assigns all-letter codes to airports with a 5,000-foot or longer runway and an advanced weather station. Smaller public-use airports have LIDs with one letter and two numbers, while small private-use airfields have two letters and two numbers.
Other Organisations
In addition to the three main organisations mentioned above, there are other aviation authorities that assign codes for specific regions or countries. For example, in the United States, some airports retained their National Weather Service (NWS) codes and appended an "X" at the end, such as "PHX" for Phoenix. In Canada, airport codes often start with "Y" followed by two letters from the city's name, such as "YOW" for Ottawa and "YVR" for Vancouver.
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Codes are used for location identification
The use of codes for location identification began in the 1930s when pilots in the United States started using the two-letter code from the National Weather Service (NWS) to identify cities. This system was later adopted by the Canadian government when establishing airports, using the existing railway codes and adding a "Y" to indicate a weather station or another letter if it lacked one. The practice of using codes for location identification became especially important as commercial airlines became more accessible and air travel gained popularity in the 1930s.
The three-letter system provides 17,576 possible combinations, allowing for a wide range of unique identifiers for airports. The first letter of each airport's code is assigned based on specific regions, such as "K" for the United States, "Y" for Australia, "S" for South America, and "E" for Germany, Scandinavia, and the UK.
ICAO's four-letter codes are used for official purposes such as Air Traffic Control and flight plans, while IATA codes are more commonly seen by passengers on tickets and luggage. Some airports have retained their NWS codes and simply appended an "X," such as PHX for Phoenix. Certain minor airfields without scheduled passenger traffic may lack IATA codes but have ICAO codes, and in the US, they may use FAA codes instead.
While some codes are intuitive, like JFK for John F. Kennedy Airport, others seem cryptic, like ORD for Chicago O'Hare. These codes are determined based on specific criteria set by the assigning organization, taking into account factors such as the presence of a manned air traffic control facility, scheduled route air carrier service, or military airlift service.
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The first letter of each code designates a specific region
Airport codes are three-letter geocode identifiers for airports and metropolitan areas worldwide. They are defined by the International Air Transport Association (IATA) and are used for ticketing and luggage tags.
The first letter of each airport code designates a specific region. For example, "K" is for the United States, "Y" for Australia, "S" for South America, and "E" for Germany, Scandinavia, and the UK. The use of these codes is governed by IATA Resolution 763 and is administered by the IATA's headquarters in Montreal, Canada.
In the United States, some airports retained their National Weather Service (NWS) codes and simply appended an "X" at the end, such as "PHX" for Phoenix. Initially, pilots in the US used two-letter codes from the NWS for identifying cities, but this system became unmanageable for cities without an NWS identifier. The three-letter system was implemented to allow for more permutations, and to avoid confusion with certain codes reserved by the US Navy and the Federal Communications Commission.
Canada's airport codes often bear little resemblance to the city's name and usually start with "Y", such as YOW for Ottawa and YYZ for Pearson International Airport in Toronto. This originates from the two-letter codes used to identify weather reporting stations in the 1930s, with "Y" indicating the presence of a weather station.
Other countries, such as Russia, China, Brazil, and Indonesia, use different second letters depending on the region within the country. For example, the US uses "PH" for Hawaii, "PA" for Alaska, and "PG" for Guam. Puerto Rico and the Virgin Islands, being part of the Caribbean, have "TJ" and "TI" as their second letters. The last two letters of the code usually relate to the city's name, such as "FA" for South Africa and "CT" for Cape Town, resulting in the code "FACT".
While the exact number of active ICAO codes isn't known, there are at least 46,000 airfields assigned these codes. ICAO (International Civil Aviation Organization) is a United Nations organization that represents aviation authorities and focuses on international civil aviation regulations. Their four-letter codes are used for official purposes such as Air Traffic Control and flight plans.
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ICAO's four-letter codes are used for official purposes
Airport codes are used to identify airports and, in some cases, metropolitan areas. They are much shorter than airport names and are useful for overcoming language barriers and difficulties with complex airport names. They also prevent confusion between airports that share the same name.
ICAO (International Civil Aviation Organization) airport codes are four-letter codes used globally in flight operations and air traffic control. They are used by pilots, air traffic control, and aviation authorities. The four letters in ICAO codes allow for over 450,000 unique combinations. The first letter of the ICAO code denotes the general geographic region of the airport, such as E for Northern Europe, S for South America, and C for Canada. 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 distributed by region and country, and the selection of ICAO codes is partly delegated to 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, this is not feasible due to the limited number of letter codes. Some countries have introduced a scheme of sub-ICAO aerodrome codes to address this issue. For example, France assigns pseudo ICAO codes in the style LFddnn, where "dd" indicates the department and "nn" is a sequential counter.
ICAO codes are not used for passenger services such as ticketing, which instead use the three-letter IATA (International Air Transport Association) codes. However, ICAO codes are useful for official purposes, such as identifying airports in flight operations and air traffic control, and they are particularly important for smaller airfields without scheduled passenger traffic that do not have IATA codes.
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Frequently asked questions
Airport codes are the 3 and 4 letter combinations used to identify airports and metropolitan areas around the world.
In the US, there are around 15,000 airports. Most are small, but each needs its own identifier. There aren't enough 3 or 4 letter combinations, so numbers are added, e.g., 4V4, 20GE.
You can find airport codes on the website World Airport Codes, or on the semi-annual IATA Airline Coding Directory.
