Chicago O'Hare International Airport (ORD) in Chicago, Illinois, USA.
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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).
Because Chicago is a large city that has enough travelers to fill the the need for two airports. O'Hare is north, Midway is south and there's a possibility of a third coming to the south suburbs. Both airports are very busy.
In 1949, the City renamed the facility O'Hare Airport to honor Edward Butch O'Hare, the U.S. Navy's first flying ace and Medal of Honor recipient in World War II.
Chicago O'Hare International Airport (IATA: ORD, ICAO: KORD, FAA LID: ORD), sometimes referred to as Chicago O'Hare, or simply O'Hare, is the main international airport serving Chicago, Illinois, located on the city's Northwest Side, approximately 17 miles (27 km) northwest of the Loop business district.
Codes in the range QAA–QNZ are reserved for aeronautical use; QOA–QQZ for maritime use and QRA–QUZ for all services. Q has no official meaning, but it is sometimes assigned a word with mnemonic value, such as Queen for example in QFE: Queen's field elevation, or Query, Question, reQuest.