Perhaps it should be a strict liability offence for more than a CASA-determined number of private aircraft to be in closer than a CASA-determined distance to each other, without CASA approval. Just cut and paste the bikie consorting laws. Let's face it: more than a few aircraft within a few square kilometres of airspace are bound to be a risk to the safety of air navigation and persons on the ground, and the pilots are bound to be in some kind of criminal conspiracy.
CASA should start with the Women Pilots Association's planned fly in to William Creek later this year. It's dangerous and unnatural enough to let one women fly, but think how dangerous and criminal it must be when more than one of 'them' get together!