Question: What is the four-letter code published in the International Civil Aviation Organization for Broumov Airport?
Sentence (from "Austral Líneas Aéreas destinations"): 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).
Relevant evidence: No