Hello,
Eyeinthesky's answer makes a lot of sense.
If you are based in GVA you can start a SARL "Société à Responsabilité Limitée". All it requires is CHF 10'000.- capital on the day the company is founded. You get them back, less tax and notary fees which amount to a total of about CHF 2'500.-.
You are then en employee of the SARL. You decide which salary the company pays you, get to deduct your legitimate cost of doing business etc... And for the aircraft owner's it is clear as well.
Good luck
