Hartsfield–Jackson Atlanta International Airport is the primary international airport serving Atlanta, Georgia, United States. The airport is located 10 mi (16 km) south of the Downtown Atlanta district. It is named after former Atlanta mayors William B. Hartsfield and Maynard Jackson. ATL covers 4,700 acres (19 km2) of land and has five parallel runways which are aligned in an east-west direction. There are three runways that are 9,000 feet (2,743 m) long, one runway that is 10,000 feet (3,048 m) long, and the longest runway at ATL measures 12,390 feet (3,776 m) long, which can handle the Airbus A380. Since 1998, Hartsfield-Jackson has been the world's busiest airport by passenger traffic. In 2023, the airport served over 104.6 million passengers, the most of any airport in the world.

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.