The flights from/to GVA it self will be test flights they are doing from time to time. I know they have done this already with the 757.
Since King Fahd is in Geneva since around 2 month most the time there are around 7 planes parked.
I have seen already:
1 747-300 (Kings Privat Jet)
1 757 (flying hospital)
1 MD11 (Cargo)
3 Gulfstreams (2 n/c and 1 o/c)
Other planes like the L130 in Saudi colors brought Cars and Equipments to GVA.
He is also visited regulary by his family, Saudi friends. A few of them might go to London or Paris for some shopping