The airport of Atlanta, officially named the International Airport "Hartsfield-Jackson" (IATA code ATL), is located 11 kms from the center of Atlanta, USA. The airport is among the busiest in the world and serves the air carriers "Delta Air Lines", "Atlantic Southeast Airlines", and "AirTran Airways". The Atlanta airport has two terminals connected to a large square with many shops, offices, car-rental companies, a train station. The buildings are six in number and are parallel. They are connected to the main terminal by an underground corridor with lots of automatic walkways. The airport can be reached by speed trains MARTA, buses and cars.