Hello PeachyLady3
In theory, this is possible. However, you would need a ticket from Geneva Airport to Thun. The PanoramaCard is only valid on buses along the Lake Thun. It is not valid on trains.
Furthermore, purchasing Supersaver tickets when arriving by air is not advisable. Supersaver tickets are only valid for a specific train connection. In the case of a flight delay and the subsequent miss of the train connection, your ticket is no longer valid, and you will have to buy a regular point-to-point ticket which is CHF 65 and valid for any connection. You might want to check for the availabilty of a full fare Saver Day Pass instead. It is also valid on any connection its price is very beneficial if bought in advance: Saver Day Pass – book earlier, travel cheaper | SBB
If you plan to go on mountain trips, the Swiss Half Fare Card is also highly recommended: Swiss Half Fare Card – Switzerland at half the price | SBB
Kind regards,
Roland