Trains operated by SBB connect the airport to the main station of Cornavin in six minutes , and carry on to towns such as Nyon , Lausanne , Fribourg , Montreux , NeuchÃ cents tel , Berne , Sion , Sierre , etc. . Trains operated by SBB-CFF-FFS connect the airport to the main station of Cornavin in a mere six minutes , and carry on to towns such as Nyon , Lausanne , Fribourg , Montreux , NeuchÃ cents tel , Berne , Sion , Sierre , etc. .