Which is airport is located in German and second busiest airport in Germany and operates a dense domestic and European network as a member of Lufthansa Cityline?
Lufthansa CityLine Lufthansa CityLine GmbH is a German airline with its headquarters on the grounds of Munich Airport. It is a wholly owned subsidiary of Lufthansa and maintains hubs at Frankfurt Airport and Munich Airport, from where it operates a dense domestic and European network as a member of Lufthansa Regional. Since October 2015, it also operates some long-haul routes on behalf of its parent company.
Frankfurt Airport loop The Frankfurt Airport loop (German: "Flughafenschleife Frankfurt") is a 15.8 kilometers long double-track railway line connecting Frankfurt and Frankfurt Airport and operated as part of the Frankfurt S-Bahn. It is electrified at 15 kV. 16.7 Hz.