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Access
Gondola from Unterterzen and Flumserberg; or drive to Flumserberg and take gondola there.
http://www.flumserberg.ch/Sommer/Bergbahnen
Rules
observe rules on infoboard!
Airspaces in Switzerland are a tough subject, get all the info you can get before flying: www.flyland.ch.
DABS (active danger areas etc): www.skybriefing.com/portal/