Airport rail link Airport), Brussels National Airport railway station (which opened in 1958 and serves Brussels Airport) and Frankfurt Airport regional station (which opened in 1972 and is one of the two railway stations that serve Frankfurt Airport). Integration with intercity services has produced alliances where airlines sell air tickets that include the connecting rail service. Central Europe has seen integration of high-speed rail into airports, with domestic and international TGV and ICE services from Charles de Gaulle Airport in Paris and Frankfurt Airport. Because of this, many airport railway stations have received IATA codes. Yet another option for airports is to use
Airport handling passenger traffic. One of the earliest such fields was Paris – Le Bourget Airport at Le Bourget, near Paris. The first airport to operate scheduled international commercial services was Hounslow Heath Aerodrome in August 1919, but it was closed and supplanted by Croydon Airport in March 1920. In 1922, the first permanent airport and commercial terminal solely for commercial aviation was opened at Flughafen Devau near what was then Königsberg, East Prussia. The airports of this era used a paved "apron", which permitted night flying as well as landing heavier aircraft. The first lighting used on an airport was