Frankfurt am Main Airport (IATA: FRA, ICAO: EDDF) (German: Flughafen Frankfurt am Main, also known as Rhein-Main-Flughafen) is a major international airport located in Frankfurt, the fifth-largest city of Germany and one of the world's leading financial centres. The official opening of the new Flug- und Luftschiffhafen Rhein-Main took place on 8 July 1936. and later became the base for the Graf Zeppelin, During World War II the Luftwaffe used the field sporadically as a fighter base and as an experimental station for jet aircraft. After the WWII the southern side of the airport ground was home to the Rhein-Main Air Base, which was a major air base for the United States from 1947 until 2005. Today the airport is operated by Fraport and as the 4th busiest in Europe and serves as the main hub for Lufthansa including Lufthansa CityLine and Lufthansa Cargo as well as Condor and AeroLogic. The airport covers an area of 2,300 hectares of land and features two passenger terminals with a capacity of approximately 65 million passengers per year, four runways and extensive logistics and maintenance facilities.