Which airport is most closely associated with XXX?
Heliswiss
Heliswiss - the oldest helicopter company in Switzerland - was founded as ``Heliswiss Schweizerische Helikopter AG`` with headquarters in Berne-Belp on April 17, 1958. This was the beginning of helicopter flying in Switzerland. During the following years Heliswiss expanded in Switzerland and formed a network with bases in Belp BE, Samedan GR, Domat Ems GR, Locarno TI, Erstfeld UR, Gampel VS, Gstaad BE and Gruyères FR. During the build-up of the rescue-company Schweizerische Rettungsflugwacht (REGA) as an independent network, Heliswiss carried out rescue missions on their behalf. Heliswiss carried out operations all over the world: in Greenland, Suriname, North Africa and South America. The first helicopter owned by Heliswiss was a Bell 47 G-1. It was registered as HB-XAG on September 23, 1953. From 1963 Heliswiss started to expand and began to operate with medium helicopters like the Agusta Bell 204B with a turbine power of 1050 HP and an external load of up to 1500 kg. From 1979 Heliswiss operated a Bell 214 (external load up to 2.8 t). Since 1991 Heliswiss operates a Russian Kamov 32A12 which was joined by a second one in 2015.