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37-717: (Redirected from THR ) [REDACTED] Look up thr in Wiktionary, the free dictionary. THR or Thr may refer to: Aviation [ edit ] Mehrabad International Airport (IATA airport code: THR), an international airport serving Tehran, the capital city of Iran Tehran Airline (ICAO airline code: THR), see List of airline codes (T) thrust (THR), see List of aviation, aerospace and aeronautical abbreviations threshold (THR), see List of aviation, aerospace and aeronautical abbreviations Biochemistry, biology, and medicine [ edit ] Target heart rate ,

74-512: A desired range of heart rate reached during aerobic exercise Threonine (Thr), an amino acid that is used in the biosynthesis of proteins Thrombin (Thr), a serine protease Tobacco harm reduction Total hip replacement Publications [ edit ] The Hollywood Reporter , an American digital and print magazine Times-Herald Record , a daily newspaper covering the northwest suburbs of New York City Other uses [ edit ] HTC–Highroad (OCI team code: THR),

111-586: A former professional cycling team competing in international road bicycle races Tharu languages (ISO 639 language code: thr) THR (soldering) , through-hole reflow soldering THR.fm , a defunct radio channel in Malaysia Yamaha THR, a series of guitar amps See also [ edit ] [REDACTED] Search for "thr" on Misplaced Pages. All pages with titles beginning with Thr All pages with titles containing Thr Thrr (disambiguation) Topics referred to by

148-567: A new airport is built, replacing the old one, leaving the city's new "major" airport (or the only remaining airport) code to no longer correspond with the city's name. The original airport in Nashville, Tennessee, was built in 1936 as part of the Works Progress Administration and called Berry Field with the designation, BNA. A new facility known as Nashville International Airport was built in 1987 but still uses BNA. This

185-410: A new terminal to replace Terminals 4 and 6. The new terminal is to have 20 gates (10 with jetbridges ) and a new CIP Terminal. It is not known when construction will start. Mehrabad Airport only handles domestic flights. Between March 2022 and March 2023, the airport received 12.3 million passengers. Mehrabad International Airport consists of 4 terminals: Formerly, Mehrabad had a Terminal 3 that

222-525: A side building (current Terminal 2) used for arrival flights. In May 1975, Iran Air started flying to New York via London with a Boeing 707. The airline launched direct service to New York using Boeing 747SPs the following June. The construction of a new airport commenced 35 kilometres (22 mi) from Tehran in 1977. The city was growing around Mehrabad, and the airfield was witnessing high amounts of traffic. Between 1970 and 1976, passenger counts had risen from 900,000 to 3,020,000. On 24 January 1979,

259-509: Is GSN and its IATA code is SPN, and some coincide with IATA codes of non-U.S. airports. Canada's unusual codes—which bear little to no similarity with any conventional abbreviation to the city's name—such as YUL in Montréal , and YYZ in Toronto , originated from the two-letter codes used to identify weather reporting stations in the 1930s. The letters preceding the two-letter code follow

296-627: Is administered by the IATA's headquarters in Montreal , Canada. The codes are published semi-annually in the IATA Airline Coding Directory. IATA provides codes for airport handling entities, and for certain railway stations. Alphabetical lists of airports sorted by IATA code are available. A list of railway station codes , shared in agreements between airlines and rail lines such as Amtrak , SNCF , and Deutsche Bahn ,

333-617: Is available. However, many railway administrations have their own list of codes for their stations, such as the list of Amtrak station codes . Airport codes arose out of the convenience that the practice brought pilots for location identification in the 1930s. Initially, pilots in the United States used the two-letter code from the National Weather Service (NWS) for identifying cities. This system became unmanageable for cities and towns without an NWS identifier, and

370-520: Is different from Wikidata All article disambiguation pages All disambiguation pages Mehrabad International Airport Mehrabad International Airport ( IATA : THR , ICAO : OIII ) is an airport serving Tehran , the capital city of Iran . Prior to the construction of the larger Imam Khomeini International Airport in 2007, Mehrabad was Tehran's primary airport for both international and domestic traffic , but now serves only domestic flights. Despite this, in 2016, Mehrabad Airport

407-523: Is different from the name in English, yet the airport code represents only the English name. Examples include: Due to scarcity of codes, some airports are given codes with letters not found in their names: The use of 'X' as a filler letter is a practice to create three-letter identifiers when more straightforward options were unavailable: Some airports in the United States retained their NWS ( National Weather Service ) codes and simply appended an X at

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444-513: Is in conjunction to rules aimed to avoid confusion that seem to apply in the United States, which state that "the first and second letters or second and third letters of an identifier may not be duplicated with less than 200 nautical miles separation." Thus, Washington, D.C. area's three airports all have radically different codes: IAD for Washington–Dulles , DCA for Washington–Reagan (District of Columbia Airport), and BWI for Baltimore (Baltimore–Washington International, formerly BAL). Since HOU

481-543: Is not followed outside the United States: In addition, since three letter codes starting with Q are widely used in radio communication, cities whose name begins with "Q" also had to find alternate codes, as in the case of: IATA codes should not be confused with the FAA identifiers of U.S. airports. Most FAA identifiers agree with the corresponding IATA codes, but some do not, such as Saipan , whose FAA identifier

518-416: Is used for William P. Hobby Airport , the new Houston–Intercontinental became IAH. The code BKK was originally assigned to Bangkok–Don Mueang and was later transferred to Suvarnabhumi Airport , while the former adopted DMK. The code ISK was originally assigned to Gandhinagar Airport (Nashik's old airport) and later on transferred to Ozar Airport (Nashik's current airport). Shanghai–Hongqiao retained

555-571: The Canadian transcontinental railroads were built, each station was assigned its own two-letter Morse code : When the Canadian government established airports, it used the existing railway codes for them as well. If the airport had a weather station, authorities added a "Y" to the front of the code, meaning "Yes" to indicate it had a weather station or some other letter to indicate it did not. When international codes were created in cooperation with

592-474: The Tehran Metro . One is for Terminals 1 and 2 , and the other is for Terminals 4 and 6 . [REDACTED]  This article incorporates public domain material from the Air Force Historical Research Agency [REDACTED] Media related to Mehrabad International Airport at Wikimedia Commons IATA airport code The assignment of these codes is governed by IATA Resolution 763, and it

629-717: The Iranian civil aviation organization to the ICAO in 1949, the airport also became an air force base. In 1955 just after the construction of the first asphalt-paved runway, a new terminal building (current Terminal 1) for both international and domestic flights was designed and constructed. In April 1956 Lockheed T-33 Shooting Stars (T-33As) trainer aircraft began arriving for the Imperial Iranian Air Force . In May 1957 these were followed by Republic F-84 Thunderjet (F-84Gs) fighter. In 1961, Mehrabad Airport added

666-481: The United States, because "Y" was seldom used in the United States, Canada simply used the weather station codes for its airports, changing the "Y" to a "Z" if it conflicted with an airport code already in use. The result is that most major Canadian airport codes start with "Y" followed by two letters in the city's name (for example, YOW for O tta w a , YWG for W innipe g , YYC for C algar y , or YVR for V ancouve r ), whereas other Canadian airports append

703-440: The airport itself instead of the city it serves, while another code is reserved which refers to the city itself which can be used to search for flights to any of its airports. For instance: Or using a code for the city in one of the major airports and then assigning another code to another airport: When different cities with the same name each have an airport, they need to be assigned different codes. Examples include: Sometimes,

740-619: The airport was serving nine million passengers annually, in addition to military flights. Due to the congestion, airlines advised travellers to arrive at Mehrabad three hours prior to departure. The new airport, now called Imam Khomeini International Airport, opened in 2004. However, political factors delayed the transfer of all international flights to the new facility. Iran Air commenced service to Caracas via Damascus in March 2007. All international flights had moved to Imam Khomeini Airport by November 2007. In June 2020, Mehrabad Airport announced

777-418: The airport's former name, such as Orlando International Airport 's MCO (for Mc C o y Air Force Base), or Chicago's O'Hare International Airport , which is coded ORD for its original name: Or char d Field. In rare cases, the code comes from the airport's unofficial name, such as Kahului Airport 's OGG (for local aviation pioneer Jimmy H ogg ). In large metropolitan areas, airport codes are often named after

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814-502: The code SHA, while the newer Shanghai–Pudong adopted PVG. The opposite was true for Berlin : the airport Berlin–Tegel used the code TXL, while its smaller counterpart Berlin–Schönefeld used SXF; the Berlin Brandenburg Airport has the airport code BER, which is also part of its branding. The airports of Hamburg (HAM) and Hannover (HAJ) are less than 100 nautical miles (190 km) apart and therefore share

851-934: The end. Examples include: A lot of minor airfields without scheduled passenger traffic have ICAO codes but not IATA codes, since the four letter codes allow more number of codes, and IATA codes are mainly used for passenger services such as tickets, and ICAO codes by pilots. In the US, such airfields use FAA codes instead of ICAO. There are airports with scheduled service for which there are ICAO codes but not IATA codes, such as Nkhotakota Airport/Tangole Airport in Malawi or Chōfu Airport in Tokyo, Japan. There are also several minor airports in Russia (e.g., Omsukchan Airport ) which lack IATA codes and instead use internal Russian codes for booking. Flights to these airports cannot be booked through

888-557: The first three letters of the city in which it is located, for instance: The code may also be a combination of the letters in its name, such as: Sometimes the airport code reflects pronunciation, rather than spelling, namely: For many reasons, some airport codes do not fit the normal scheme described above. Some airports, for example, cross several municipalities or regions, and therefore, use codes derived from some of their letters, resulting in: Other airports—particularly those serving cities with multiple airports—have codes derived from

925-478: The following format: Most large airports in Canada have codes that begin with the letter "Y", although not all "Y" codes are Canadian (for example, YUM for Yuma, Arizona , and YNT for Yantai , China), and not all Canadian airports start with the letter "Y" (for example, ZBF for Bathurst, New Brunswick ). Many Canadian airports have a code that starts with W, X or Z, but none of these are major airports. When

962-597: The form of " YYZ ", a song by the rock band Rush , which utilizes the Morse code signal as a musical motif. Some airports have started using their IATA codes as brand names , such as Calgary International Airport (YYC) and Vancouver International Airport (YVR). Numerous New Zealand airports use codes that contain the letter Z, to distinguish them from similar airport names in other countries. Examples include HLZ for Hamilton , ZQN for Queenstown , and WSZ for Westport . Predominantly, airport codes are named after

999-487: The international air booking systems or have international luggage transferred there, and thus, they are booked instead through the airline or a domestic booking system. Several heliports in Greenland have 3-letter codes used internally which might be IATA codes for airports in faraway countries. There are several airports with scheduled service that have not been assigned ICAO codes that do have IATA codes, especially in

1036-626: The military took control of Mehrabad and other airports in the country in an attempt to prevent Ayatollah Ruhollah Khomeini's return from exile in Paris. It ultimately relented and permitted his arrival at Mehrabad aboard a chartered Air France plane eight days later. At the beginning of the Iran–Iraq War in September 1980, Iraq carried out an air strike on the airport. In the 1980s, Mehrabad's route network spanned from Paris to Beijing. By 2000,

1073-612: The name of the airport itself, for instance: This is also true with some cities with a single airport (even if there is more than one airport in the metropolitan area of said city), such as BDL for Hartford, Connecticut 's B ra dl ey International Airport or Baltimore's BWI, for B altimore/ W ashington I nternational Airport ; however, the latter also serves Washington, D.C. , alongside Dulles International Airport (IAD, for I nternational A irport D ulles) and Ronald Reagan Washington National Airport (DCA, for D istrict of C olumbia A irport). The code also sometimes comes from

1110-416: The one they are located in: Other airport codes are of obscure origin, and each has its own peculiarities: In Asia, codes that do not correspond with their city's names include Niigata 's KIJ , Nanchang 's KHN and Pyongyang 's FNJ . EuroAirport Basel Mulhouse Freiburg , which serves three countries, has three airport codes: BSL, MLH, EAP. Some cities have a name in their respective language which

1147-506: The same first and middle letters, indicating that this rule might be followed only in Germany. Many cities retain historical names in their airport codes, even after having undergone an official name/spelling/transliteration change: Some airport codes are based on previous names associated with a present airport, often with a military heritage. These include: Some airports are named for an administrative division or nearby city, rather than

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1184-403: The same term [REDACTED] This disambiguation page lists articles associated with the title Thr . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Thr&oldid=1209674028 " Category : Disambiguation pages Hidden categories: Short description

1221-500: The station code of Malton, Mississauga , where it is located). YUL is used for Montréal–Trudeau (UL was the ID code for the beacon in the city of Kirkland , now the location of Montréal–Trudeau). While these codes make it difficult for the public to associate them with a particular Canadian city, some codes have become popular in usage despite their cryptic nature, particularly at the largest airports. Toronto's code has entered pop culture in

1258-515: The two-letter code of the radio beacons that were the closest to the actual airport, such as YQX in Gander or YXS in Prince George . Four of the ten provincial capital airports in Canada have ended up with codes beginning with YY, including: Canada's largest airport is YYZ for Toronto Pearson (as YTZ was already allocated to Billy Bishop Toronto City Airport , the airport was given

1295-529: The use of two letters allowed only a few hundred combinations; a three-letter system of airport codes was implemented. This system allowed for 17,576 permutations, assuming all letters can be used in conjunction with each other. Since the U.S. Navy reserved "N" codes, and to prevent confusion with Federal Communications Commission broadcast call signs , which begin with "W" or "K", the airports of certain U.S. cities whose name begins with one of these letters had to adopt "irregular" airport codes: This practice

1332-631: Was the busiest airport in Iran in terms of passengers, handling 16,678,351 passengers in total. The airport is also used by the Government of Iran and is one of the bases of the Iranian Air Force . The airport was used for the first time as an airfield for aviation club planes in 1938. During World War II it became a stopover point for the U.S. Air Transport Command . After the war, along with becoming internationally recognized by joining

1369-567: Was used for Hajj Flights, which were transferred to Imam Khomeini. Later it was used for Cargo flights which were also transferred to Imam Khomeini. The airport is home to the head offices of Iran Air and the Iran Civil Aviation Organization . In addition the Iranian Airports Company also has its head office at Mehrabad Airport, nearby Terminal 2. The airport is served by two stations of

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