Private ops
I agree with Jabawocky,
The important thing here is that because the pilot is part of the company and he is at work whilst flying the plane, he is technically carrying out pilotage duties for reward. So to keep it a private operation, the pilot would have to have a CPL or share in the cost of the aircraft being the pilot in command. I used to work in a situation like this and we had no AOC and never had any dramas from CASA.
Maloo