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A location identifier is a symbolic representation for the name and the location of an airport, navigation aid, or weather station, and is used for manned air traffic control facilities in air traffic control, telecommunications, computer programming, weather reports, and related services.
The International Civil Aviation Organization establishes sets of 4-letter location indicators which are published in ICAO Publication 7910. These are used by air traffic control agencies to identify airports and by weather agencies to produce METAR weather reports. The first letter indicates the region; for example, K for the contiguous United States, C for Canada, E for northern Europe, R for the Asian Far East, and Y for Australia. Examples of ICAO location indicators are RPLL for Manila Ninoy Aquino Airport and KCEF for Westover Joint Air Reserve Base.
The International Air Transport Association uses sets of 3-letter IATA identifiers which are used for airline operations, baggage routing, and ticketing. There is no specific organization scheme to IATA identifiers; typically they take on the abbreviation of the airport or city such as MNL for Manila Ninoy Aquino Airport.
In the United States, the IATA identifier usually equals the FAA identifier, but this is not always the case. A prominent example is Sawyer International Airport, Michigan, which uses the FAA identifier SAW and the IATA identifier MQT.
The Federal Aviation Administration location identifier (FAA LID) is a three- to five-character alphanumeric code identifying aviation related facilities inside the United States, though some codes are reserved for, and are managed by other entities. §1–2-1:
For nearly all major airports, the assigned identifiers are alphabetic three-letter codes, such as ORD for Chicago O’Hare International Airport. Minor airfields are typically assigned a mix of alphanumeric characters, such as 8N2 for Skydive Chicago Airport and 0B5 for Turners Falls Airport. Private airfields are assigned a four-character identifier, such as 1CA9 for Los Angeles County Fire Department Heliport. The location identifiers are coordinated with the Transport Canada Identifiers described below.
In general, the FAA has authority to assign all three-letter identifiers (except those beginning with the letters K, N, W, and Y), all three and four character alphanumeric identifiers, and five-letter identifiers for the United States and its jurisdictions. The Department of the Navy assigns three-letter identifiers beginning with the letter N for the exclusive use of that Department. Transport Canada assigns three character identifiers beginning with Y. The block beginning with letter Q is under international telecommunications jurisdiction, but is used internally by FAA Technical Operations to identify National Airspace equipment not covered by any other identifying code system. The block beginning with Z identifies United States Air Route Traffic Control Centers. §1–2-2:
In practice, the assigned identifiers are not always consistent with the current "encoding" rules adopted by the FAA, nor are all the assigned identifiers unique between the United States and Canada. The coding system has evolved over time, and to ensure safety and reduce ambiguity, many "legacy" codes have remained intact, §1–2–4 even though they violate the currently ordered rules. For this reason, the FAA regularly publishes detailed listings of all codes it administers :§6:
In general, three-letter identifiers are assigned as radio call signs to aeronautical navigation aids; to airports with a manned air traffic control facility or navigational aid within airport boundary; to airports that receive scheduled route air carrier or military airlift service, and to airports designated by the United States Customs Service as Airports of Entry. Some of these identifiers are assigned to certain aviation weather reporting stations.
Most one-number, two-letter identifiers have been assigned to aviation weather reporting and observation stations and special-use locations. Some of these identifiers may be assigned to public-use landing facilities within the United States and its jurisdictions, which do not meet the requirements for identifiers in the three-letter series. In this identifier series, the number is always in the first position of the three-character combination.
Most one-letter, two-number identifiers are assigned to public-use landing facilities within the United States and its jurisdictions, which do not meet the requirements for identifiers in the three-letter series. Some of these identifiers are also assigned to aviation weather reporting stations.
Two-letter, two-number identifiers are assigned to private-use landing facilities in the United States and its jurisdictions which do not meet the requirements for three-character assignments. They are keyed by the two-letter Post Office or supplemental abbreviation of the state with which they are associated. The two letter code appears in the first two, middle, or last two positions of the four character code.
The use of the FAA identifier system in meteorology ended in 1996 when airways reporting code was replaced by METAR code. The METAR code is dependent wholly on the ICAO identifier system.
Transport Canada assigns two, three, and four character identifiers, including three letter identifiers beginning with letters Y and Z, for its areas of jurisdiction. These identifiers are designed to mesh with the FAA Identifier system described above, though a few conflicts exist (such as WMC for both Winnemucca NV and Maple Creek SK, and WAL for Wallops Island VA and Cooking Lake AB).
The airfields code of Direction General of Civil Aeronautics of Mexico is a designator airfields code compound 3 alphabetic characters used to identify all fields of civil aviation in Mexico (these characters are chosen with the same methodology for IATA Code, i.e. , taking 3 letters of the airfield, for example ZPU Zacapu Airstrip), these airfields can be airports, regional airports, private airstrips, heliports, boat-heliports and helipads platform-; if more substantial airports IATA designator code is used, for example TLC for Toluca International Airport, although there are some exceptions, such IATA: XAL and DGAC: ALA to Alamos National Airport, Sonora.
Within Russia (and before 1991 within the Soviet Union), there are airport identifiers (внутренней код - internal code) having three Cyrillic letters.They are used for e.g. ticket sales. Some small airports with scheduled flights have no IATA code, only this code and an ICAO code. Unlike the IATA codes, they changed when renaming some cities of the former USSR in the 1990s, e.g. Saint Petersburg (was Leningrad) - was ЛЕД, became СПТ. As of 2009, about 3,000 code combinations of internal code are in use.
The World Meteorological Organization uses a system of five-digit numeric station codes to represent synoptic weather stations. An example is 72295 for Los Angeles International Airport. The first number specifies the region: 0 to 1 for Europe, 2 to 3 for Russia, 4 for Asia, 5 for the Far East, 6 for Africa, 7 for North America, 8 for South America and Antarctica, and 9 for the Pacific. The remainder of the numbers are set at the regional and national level.
The National Weather Service uses several schemes for identifying stations. It typically relies on the ICAO and WMO identifiers, although several weather forecast offices (WFOs) and weather radar sites that have moved away from airports have been given their own codes which do not conflict with existing codes. These typically end in X, such as where Birmingham, Alabama (BHM) had its radar site replaced by one south of the city (BMX), or where the Knoxville (TYS) office was moved to nearby Morristown, Tennessee (MRX). Others have changed such that Miami, Florida is now MFL instead of MIA, and Dallas/Fort Worth (formerly DFW) is now FWD. Climatological applications use the WBAN (Weather Bureau Army Navy) system, which is a five-digit numeric code for identifying weather stations under its jurisdiction.
Recently it began using four-letter-plus-one-number identifiers for specialized weather requirements such as hydrometeorological stations. These are used by the USFS RAWS system, and by the stream gauges operated by the USGS, both of which report through GOES weather satellites operated by NOAA. These use three letters which are a mnemonic for the location, followed by the first letter of the U.S. state, followed by a numeral indicating the alphabetical order within that letter (for example, North Carolina stations end with N7). The mnemonic may be the nearest town, or the name of the stream, or a combination of the two; and the same names may be rearranged into different mnemonics for different nearby locations. For example, VING1 is the gauge at Vinings, Georgia, and is differentiated from other stations along the Chattahoochee River (such as CHAG1 in nearby Oakdale) which are also at the Atlanta city limit like Vinings is, and from other streams in Atlanta such as Peachtree Creek (AANG1).
The United States Air Force Weather Agency (AFWA), acting on behalf of all the American military services, assigns special use ICAO identifiers beginning with "KQ", for use by deployed units supporting real-world contingencies; deployed/in-garrison units providing support during exercises; classified operating locations; and units that have requested, but not yet received a permanent location identifier.
One system still used by both the Air Force and National Climatic Data Center is the Master Station Catalog or MASLIB code. This is a 6-digit numeric code that is essentially the same scheme as the WMO station identifier but adds an extra digit, allowing many more stations to be indexed. This extra digit is always "0" when referencing an actual WMO station using the 5-digit identifier, but may be 1..9 to reference other stations that exist in the vicinity. The MASLIB identifiers are not generally recognized outside the United States.
There have been rare instances where identifiers have been transplanted to new locations, mainly due to the closure of the original airport. Prominent examples are DEN/KDEN, which migrated from Stapleton International Airport to Denver International Airport in 1996, and AUS/KAUS, which migrated from Austin Mueller Municipal Airport to Austin-Bergstrom International Airport in 1999. Both of these cases occurred because the original locations were closed.
Occasionally a code will be discontinued entirely, with no successor. Sometimes this is a small airport that has closed, such as Stone Mountain Airport, whose identifier 00A is now used for an R/C heliport in Bensalem, Pennsylvania. In another case, the identifiers for Idlewild Airport in New York were changed to JFK and KJFK when it was renamed after John F. Kennedy, and its original IDL and KIDL were later reused for Indianola Municipal Airport in Indianola, Mississippi.
Transplanted identifiers tend to be poorly documented, and can cause problems in data systems and software which process historical records and in research and legal work. A similar problem also exists for broadcast callsigns.
An IATA airport code, also known as an IATA location identifier, IATA station code or simply a location identifier, is a three-letter geocode designating many airports and metropolitan areas around the world, defined by the International Air Transport Association (IATA). The characters prominently displayed on baggage tags attached at airport check-in desks are an example of a way these codes are used.
The ICAOairport 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.
METAR is a format for reporting weather information. A METAR weather report is predominantly used by aircraft pilots, and by meteorologists, who use aggregated METAR information to assist in weather forecasting.
Naval Air Station Whiting Field – South, also known as South Whiting Field, is located three miles (5 km) north of the central business district of Milton, in Santa Rosa County, Florida, United States. This military airport is owned by the US Navy. It is one of two airfields located at Naval Air Station Whiting Field, the other airfield being NAS Whiting Field – North.
New Century AirCenter, formerly known as Naval Air Station Olathe, Flatley Field and Johnson County Industrial Airport, is a joint civil-military general aviation airport located four miles (6 km) southwest of the central business district of Olathe, a city in Johnson County, Kansas, United States. Measured by number of aircraft operations, the facility was the second-busiest airport in the state of Kansas in 2019.
Pompano Beach Airpark is a public airport located one mile (1.6 km) northeast of the central business district of Pompano Beach, in Broward County, Florida, United States. This airport is publicly owned by City of Pompano Beach.
Cherokee County Airport is a county-owned public use airport in Cherokee County, Texas, United States. It is located six nautical miles southeast of the central business district of Jacksonville, Texas.
Tinian International Airport, also known as West Tinian Airport, is a public airport located on Tinian Island in the United States Commonwealth of the Northern Mariana Islands. This airport is owned by Commonwealth Ports Authority.
This is a list of airline codes. The table lists IATA's two-character airline designators, ICAO's three-character airline designators and the airline call signs. Historical assignments are also included.
Airlake Airport is a public use airport in Dakota County, Minnesota, United States. Owned by the Metropolitan Airports Commission, it is 22 nautical miles (35 km) south of the central business district of Minneapolis. The airport is located near the Twin Cities suburbs of Lakeville and Farmington.
Dare County Regional Airport is a public airport located one mile (2 km) northwest of the central business district (CBD) of Manteo, a town in Dare County, North Carolina, United States. This general aviation airport covers 340 acres (138 ha) and has two runways.
Aurora State Airport is a public airport located one mile (2 km) northwest of the central business district of Aurora, a city in Marion County, Oregon, United States. It is owned by the Oregon Department of Aviation.
Tillamook Airport is a public use airport located 3 miles (4.8 km) south of the central business district of Tillamook, a city in Tillamook County, Oregon, United States. It is owned by the Port of Tillamook Bay. According to the FAA's National Plan of Integrated Airport Systems for 2009–2013, it is categorized as a general aviation facility.
Brooksville–Tampa Bay Regional Airport, formerly known as Hernando County Airport, is a joint civil-military public airport located 6 nautical miles (11 km) southwest of the central business district of Brooksville, a city in Hernando County, Florida, United States. It is owned by Hernando County and is 45 miles (72 km) north of Tampa. While having consistent growth in its traffic rate, it does not yet serve the public through commercial airlines, but it does have charter and executive service.
DeLand Municipal Airport, also known as Sidney H. Taylor Field, is a city-owned public-use airport located three nautical miles (5 km) northeast of the central business district of DeLand, a city in Volusia County, Florida, United States.
Flagler County Airport is a county-owned public-use airport located three miles (5 km) east of the central business district of Bunnell, a city in Flagler County, Florida, United States. The airport's former FAA location identifiers were X47 and XFL. The airfield was originally constructed by the United States Navy during World War II as Naval Outlying Field Bunnell , an auxiliary airfield for flight training operations originating from nearby Naval Air Station Jacksonville, NAS Daytona Beach and NAS DeLand. Following the end of the war, the airfield was transferred from the Navy to Flagler County for use as a general aviation airport.
La Junta Municipal Airport is three miles north of La Junta, in Otero County, Colorado. The National Plan of Integrated Airport Systems for 2011–2015 categorized it as a general aviation facility.
Cleveland Municipal Airport is a public use airport in Bolivar County, Mississippi, United States. It is owned by the City of Cleveland and located two nautical miles (4 km) northwest of its central business district. This airport is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a general aviation facility. There is no scheduled commercial airline service.
Naval Outlying Field (NOLF) Santa Rosa is a military use airport located five nautical miles (9 km) southeast of the central business district of Milton, in Santa Rosa County, Florida, United States. It is owned by the United States Navy and has four asphalt paved runways all of which are 4,500 by 150 feet. The airfield is under the control of Commander, Training Air Wing FIVE at NAS Whiting Field, Florida.
John Bell Williams Airport is a public use airport in Hinds County, Mississippi, United States. It is located in Bolton, Mississippi, three nautical miles (6 km) northeast of the center of Raymond, Mississippi, The airport is owned by Hinds Community College.