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Airport codes are three- or four-letter codes used to identify airports. There are two main types of airport codes: IATA (International Air Transport Association) and ICAO (International Civil Aviation Organization). IATA codes are three-letter codes used for most commercial airports worldwide, while the less common ICAO codes are four-letter codes used for airports that haven't been assigned an IATA code. These codes are used by passengers when booking flights and by air traffic control for flight planning. Airport codes are often derived from the name of the city or airport, but sometimes they come from an airport's former or unofficial name, or something relevant to the area.
| Characteristics | Values |
|---|---|
| Number of airport codes | 8,965 |
| Number of bus station codes | 235 |
| Number of rail station codes | 816 |
| Number of heliport codes | 151 |
| Number of ferry port codes | 64 |
| Number of location codes | 11,000+ |
| Number of permutations with a three-letter system | 17,576 |
| Number of letters in airport codes | 3 or 4 |
| Number of letters in FAA LIDs | 3 or 4 |
| Number of letters in ICAO codes | 4 |
| Number of letters in IATA codes | 3 |
| Letters not supposed to be used at the start of FAA LIDs | K, N, Q, W, Y, Z |
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What You'll Learn
Airport codes are three or four letters long
Airport codes are typically three or four letters long. The three-letter codes are known as IATA codes, defined by the International Air Transport Association. IATA codes are used to identify most commercial airports worldwide, as well as some bus, rail, helicopter, and ferry terminals. These codes are used for ticketing and baggage transfers, and they are published in the IATA Airline Coding Directory.
The four-letter codes are ICAO codes, defined by the International Civil Aviation Organization. ICAO codes are used for airports that haven't been assigned an IATA code, and they are also used by air traffic control. ICAO codes are designed to be concise and unambiguous for pilots and air traffic control.
The codes are derived in various ways. Some are based on the first three letters of the airport's city, like MIA for Miami International or DEN for Denver International. Others are based on the name of the airport, like JFK for John F. Kennedy International Airport in New York City, or on the airport's former or unofficial name, like Chicago O'Hare's ORD, which stands for Orchard Field, its previous name. Some codes are more creative, like PIE for St. Pete's-Clearwater International Airport, which has the website fly2pie.com. Others seem to be based on humour, like OMG for Omega Airport in Namibia, or SUX for Sioux City, Iowa.
In Canada, many airport codes begin with the letter "Y", which was originally added to indicate that the airport had a weather station. However, not all "Y" codes are Canadian, and not all Canadian airports start with "Y". Some major airports in Canada have codes that start with W, X, or Z.
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IATA and ICAO codes
Airport codes are three-letter or four-letter codes used to identify a particular airport. There are two main types of airport codes: IATA (International Air Transport Association) and ICAO (International Civil Aviation Organization).
IATA Codes
IATA codes are three-letter codes used to refer to most commercial airports worldwide. They are also assigned to bus, rail, helicopter, and ferry terminals that codeshare with airlines for ticketing and baggage transfers. Most IATA codes are derived from the first three letters of an airport's city, like MIA for Miami International or DEN for Denver International. Other codes reference the name of the airport itself, like MDW for Chicago Midway International or JFK for John F. Kennedy International Airport in New York City. No two airports are allowed to share an IATA code.
ICAO Codes
ICAO codes, assigned by the International Civil Aviation Organization, are four-letter codes. They are used globally in flight operations and by air traffic control officials. ICAO codes are used for airports that haven't been given an IATA code.
FAA LIDs
The Federal Aviation Administration (FAA) assigns Location Identifiers (LIDs) to airports within the United States. LIDs are three or four letters long and are only involved in domestic flight operations. Every airport receives an assignment of one, two, or even all three types of codes.
Examples of IATA and ICAO Codes
- Birmingham, Alabama: IATA code BHM
- Birmingham, UK: IATA code BHX
- Nashville International Airport: IATA code BNA
- Washington-Dulles: IATA code IAD
- Washington-Reagan: IATA code DCA
- Baltimore: IATA code BWI
- Kyiv: IATA code IEV
- Chicago's O'Hare: IATA code ORD
- Vancouver International Airport: IATA code YVR
- Toronto Pearson: IATA code YYZ
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How airport codes are used
Airport codes, also known as IATA airport codes, are three-letter codes that uniquely identify airports all around the world. These codes are used for various purposes within the aviation industry and by travellers. Here is how airport codes are used:
For Flight Scheduling and Planning: Airport codes are essential for flight scheduling and planning by airlines and aviation authorities. They enable quick and accurate identification of departure and arrival airports. When creating flight schedules, airlines use these codes to specify the exact locations where their flights will originate and terminate. This helps in routing flights, allocating resources, and coordinating with airports for landing and takeoff slots.
In Ticketing and Reservations: Airport codes are prominently used in ticketing and reservation systems. When booking a flight, travellers input the airport code of their desired departure and destination airports. These codes are then linked to the corresponding flight schedules, allowing travellers to select specific flights and plan their journeys. The codes simplify the booking process, ensuring that travellers can easily identify and choose the correct airports.
Baggage Routing and Handling: Airport codes play a crucial role in baggage routing and handling. Each piece of checked baggage is labelled with the airport code of its intended destination. This helps ground handling staff and baggage sorting systems to efficiently direct baggage to the correct aircraft and, upon arrival, to the correct baggage claim area. The use of airport codes streamlines the baggage handling process, reducing the chances of misrouting or losing luggage.
Air Traffic Control and Communication: Airport codes are commonly used in air traffic control (ATC) communications. Air traffic controllers use these codes to identify airports during radio communications with pilots. This helps establish a clear and concise understanding of the locations being referenced. For example, when providing flight clearance or issuing instructions, ATC may use the airport code to specify the departure or destination airport, ensuring precise and unambiguous communication.
In Navigation and Flight Planning: Airport codes are integrated into navigation systems and flight planning tools. Pilots and flight crews use these codes to set navigation waypoints, plan routes, and programme flight management systems. By inputting the airport code of their destination, pilots can obtain essential information such as runway orientations, navigation aids, and airport elevation. This aids in accurate navigation and ensures safe and efficient flight operations.
For Airport Identification by Travellers: Airport codes help travellers easily identify and refer to specific airports. When discussing travel plans, checking flight information, or booking ground transportation, knowing the airport code simplifies communication and reduces confusion. It allows travellers to quickly distinguish between airports with similar names or in close proximity. This is especially useful when multiple airports serve a single city or region.
In summary, airport codes serve as unique identifiers, facilitating efficient operations within the aviation industry. They streamline processes related to flight scheduling, ticketing, baggage handling, air traffic control, and navigation. Additionally, airport codes provide convenience and clarity for travellers when discussing or planning their journeys. By using these three-letter codes, the global air transport system becomes more organized, coordinated, and comprehensible for all stakeholders involved.
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History of airport codes
Airport codes, also known as IATA location identifiers or simply location identifiers, are three-letter geocodes designating airports and metropolitan areas worldwide. They are defined by the International Air Transport Association (IATA) and are used for flight ticketing, baggage handling, and cargo shipping. The use of airport codes arose out of convenience for pilots in identifying locations in the 1930s.
Initially, pilots in the United States used the two-letter code from the National Weather Service (NWS) for identifying cities. However, with the increase in air travel, this system became unmanageable, as it only allowed for a few hundred combinations. Thus, a three-letter system was implemented, offering 17,576 permutations. The three-letter codes were standardised by IATA in the 1960s.
Most IATA codes are derived from the first three letters of an airport's city, like MIA for Miami International or DEN for Denver International. Some codes reference the name of the airport itself, like MDW for Chicago Midway International or JFK for John F. Kennedy International Airport in New York City. Other codes are based on previous names associated with the airport, often with a military heritage. For example, Chicago's O'Hare International Airport is coded ORD based on its original name, Orchard Field. Some codes hold hidden stories, blending history, geography, and culture, such as Nashville's BNA code, which stands for Berry Field, the former name of the airport.
In Canada, many airport codes start with the letter "Y", a legacy of the country's radio navigation system. When Canadian airports adjusted their IATA codes in the early 1940s, they added a “Y” to indicate the presence of a nearby weather station or another letter to indicate the absence of one. This is why most large Canadian airports have codes beginning with "Y", although not all "Y" codes are Canadian, and not all Canadian airports start with "Y".
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Airport codes in Canada
Airport codes, also known as IATA location identifiers or location identifiers, are three- or four-letter codes used to identify a particular airport. The three-letter IATA codes are used for most commercial airports worldwide, while the four-letter ICAO codes are used for airports that don't have an IATA code.
In Canada, most airport codes begin with the letter "Y", although not all "Y" codes are for Canadian airports. For example, YVR is the code for Vancouver International Airport, and YYZ is the code for Toronto Pearson Airport. This is because, in the 1930s, Canada built a national network of weather towers with two-letter codes, and when IATA adopted a three-letter code system in the 1940s, Canada simply added a "Y" to the front of their existing codes. Some smaller Canadian airports do not follow this convention, such as Shamattawa Airport (ZTM) in Manitoba and Edmonton/Villeneuve Airport (ZVL) in Alberta.
Some Canadian airport codes that do not begin with "Y" include ZBF for Bathurst, New Brunswick, YTM for Mont-Tremblant International Airport in La Macaza, Quebec, YUL for Montréal-Trudeau International Airport in Montreal, Quebec, and YYC for Calgary International Airport in Calgary, Alberta.
It is important to note that airport codes are not always intuitive, and it is easy to book tickets to the wrong airport if you are not careful. For example, Sydney, Canada uses the code YQY, while Sydney, Australia uses SYD. Therefore, it is important to double-check the IATA code when booking travel to ensure you are going to the correct destination.
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Frequently asked questions
Airport codes are three- or four-letter codes used to identify a particular airport.
There are two main types of airport codes: IATA (International Air Transport Association) and ICAO (International Civil Aviation Organization). The less common ICAO codes are four-letter codes used for airports that haven't been assigned an IATA code and by air traffic control. IATA codes are the three-letter codes most travellers are familiar with and are used for flight ticketing, baggage handling, and cargo shipping.
Airport codes are often derived from the first three letters of the airport's city, like MIA for Miami International or DEN for Denver International. They can also be based on the name of the airport, like JFK for John F. Kennedy International Airport in New York City. In other cases, an airport's code may reference an aspect of the city's history or specific location, like MSY for Louis Armstrong International Airport in New Orleans, honouring pioneering pilot John Moisant.
