Question: What is the four-letter code published in the International Civil Aviation Organization for Broumov Airport?

full_context: Document 1: Flight plan: Flight plans are documents filed by a pilot or flight dispatcher with the local Civil Aviation Authority (e.g. the FAA in the United States) prior to departure which indicate the plane's planned route or flight path. Flight plan format is specified in ICAO Doc 4444. They generally include basic information such as departure and arrival points, estimated time en route, alternate airports in case of bad weather, type of flight (whether instrument flight rules [IFR] or visual flight rules [VFR]), the pilot's information, number of people on board and information about the aircraft itself. In most countries, flight plans are required for flights under IFR, but may be optional for flying VFR unless crossing international borders. Flight plans are highly recommended, especially when flying over inhospitable areas, such as water, as they provide a way of alerting rescuers if the flight is overdue. In the United States and Canada, when an aircraft is crossing the Air Defense Identification Zone (ADIZ), either an IFR or a special type of VFR flight plan called a DVFR (Defense VFR) flight plan must be filed. For IFR flights, flight plans are used by air traffic control to initiate tracking and routing services. For VFR flights, their only purpose is to provide needed information should search and rescue operations be required, or for use by air traffic control when flying in a "Special Flight Rules Area".
Document 2: Austral Líneas Aéreas destinations: Following is a list of destinations currently served by Austral Líneas Aéreas, as of 2013 . Each destination is provided with the country name, the name of the airport served, and both its International Air Transport Association (IATA) three-letter designator (IATA airport code) and its International Civil Aviation Organization (ICAO) four-letter designator (ICAO airport code). The list also includes the airports that serve either as a hub or as a focus city for the carrier. Terminated destinations are additionally presented.
Document 3: Viasa destinations: Following is a list of destinations Viasa flew to as part of its scheduled destinations. Each city is provided with the name of the country, the name of the airport served, and both its International Air Transport Association (IATA) three-letter designator (IATA airport code) and International Civil Aviation Organization (ICAO) four-letter designator (ICAO airport code). Hubs and destinations served at the time of closure are also marked.
Document 4: Bromma Air Maintenance: Bromma Air Maintenance AB (BAM), is a Swedish company specialized in maintenance on fixed-wing and rotor-wing aircraft. Certified in accordance with EASA part-145. BAM headquarters is at Stockholm-Bromma Airport in Stockholm, Sweden. BAM has subsidiaries on the Airport of Norrköping, Malmslätt Airport in Linköping and on the local airport in Sveg.
Document 5: Brainerd Lakes Regional Airport: Brainerd Lakes Regional Airport (IATA: BRD, ICAO: KBRD, FAA LID: BRD) is a public use airport located three nautical miles (6 km) northeast of the central business district of Brainerd, a city in Crow Wing County, Minnesota, United States. The airport is owned by the city and county. It is mostly used for general aviation but is also served by one commercial airline.
Document 6: Broumov Airport: Broumov Airport (ICAO airport code LKBR) is an airport in Broumov in the Czech Republic.
Document 7: British Airways destinations: British Airways is one of few carriers serving destinations across all six inhabited continents. Following is a list of destinations the airline flies to, as of 2017 ; terminated destinations are also listed. The list does not include cities served solely by affiliated regional carriers, and some terminated destinations may now be served either via franchise or through codeshare agreements with other carriers. Each destination is provided with the name of the country served, the name of the airport served, and both the International Air Transport Association (IATA) three-letter designator (IATA airport code) and the International Civil Aviation Organization (ICAO) four-letter designator (ICAO airport code).
Document 8: Arad International Airport: Arad International Airport (IATA: ARW, ICAO: LRAR) is located 4 km west of Arad, in western Romania, in the historical region of Crișana. The airport is located only 60 km north of Timişoara Airport. Arad International Airport also has a cargo terminal, the largest and most modern in western Romania. It is located 250 km from Budapest and 300 km from Belgrad. It’s located near the border with Hungary, only 30 km from the closest point for crossing the border - Turnu and 20 km away from the closest railway point for crossing the border - Curtici. The airport also serves as the SMURD regional air ambulance base for the 5 western counties that form the region (Arad, Bihor, Timis, Hunedoara & Caras-Severin). SMURD Arad operates 1 Eurocopter EC135 converted for the air ambulance role. Arad Airport is directly connected to the A1 motorway (part of the Pan-European Corridor IV), one of the most important and heavily used motorways in Romania.
Document 9: ICAO airport code: The ICAO ( , ) airport code or location indicator is a four-letter code designating aerodromes around the world. These codes are 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.
Document 10: List of airports in the Greater Toronto Area: There are eight airports in the Greater Toronto Area (GTA); two of which provide scheduled passenger service. The two airports, Toronto Pearson International Airport and Billy Bishop Toronto City Airport, are located within the GTA. Two other airports, namely the Region of Waterloo International Airport and John C. Munro Hamilton International Airport, are passenger airports located in the outskirts of the metropolitan area. The four airports are included in the airport metrocode YTO, designated by the International Air Transport Association (IATA).
Document 11: Braeburn Airport: Braeburn Airport, also known as the Cinnamon Bun Airstrip, (TC LID: CEK2) in the Yukon, Canada, is adjacent to the Klondike Highway between Whitehorse and Carmacks. It is next to Braeburn Lodge (famous for its oversized cinnamon buns and sandwiches) and near Braeburn Lake. It receives no maintenance and pilots are advised to use caution as there are numerous holes in the runway caused by gophers.
Document 12: Jonava Airport: Jonava Airport also known as Rukla or Gaižiūnai Airfield (Lithuanian: "Jonavos aerodromas" ; ICAO: EYRU) was a military airfield in Lithuania located 9 km southeast of Jonava. It was part of Rukla–Gaižiūnai military facilities. The airport featured a linear ramp with 24 parking spaces. It is no longer used as an airfield and hosts various racing events.
Document 13: Aero L-60 Brigadýr: The Aero L-60 Brigadýr (Czech: "Brigadier" ) was a small, high-wing propeller-driven Czechoslovakian STOL utility aircraft developed for both civil and military use. A prototype, designated XL-60, with Argus As 10C engine, first flew on December 24, 1953, but it was not successful. The plane was thoroughly redesigned and the second improved prototype, with M-208B flat-six engine, flew on June 8, 1954. The aircraft's configuration bears a strong resemblance to the Fieseler Fi 156 "Storch" licence-produced in Czechoslovakia during and after World War II (as K-65 Čáp), and which this aircraft was intended to replace. By the end of production in 1960, 273 had been built by Aero, including an improved version, the L-160 with an all-metal tail.
Document 14: NATO phonetic alphabet: The International Radiotelephony Spelling Alphabet, commonly known as the ICAO phonetic alphabet, sometimes called the NATO phonetic alphabet or spelling alphabet and the ITU radiotelephonic or phonetic alphabet, is the most widely used radiotelephonic spelling alphabet. Although often called "phonetic alphabets", spelling alphabets are unrelated to phonetic transcription systems such as the International Phonetic Alphabet. Instead, the International Civil Aviation Organization (ICAO) alphabet assigned codewords acrophonically to the letters of the English alphabet, so that critical combinations of letters and numbers are most likely to be pronounced and understood by those who exchange voice messages by radio or telephone, regardless of language differences or the quality of the communication channel.
Document 15: IATA airport code: An IATA airport code, also known as an IATA location identifier, IATA station code or simply a location identifier, is a three-letter code designating many airports 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.
ground_truth: LKBR