I was curious about the comment made about the APA (Australian Pattern Association) and how they address mid-air's so I emailed Henry Hutchinson the current APA Contest Director. Here is his reply.

"Hi Glen to answer you ,we do not have any rule regarding mid air`s but we do have a fund to compensate the flyers in the event of a mid air.
Because we fly nearly all comps using two intermingleing lines, it is amazing we have very few mid air`s,we charge all competitors five dollars per event to build up a fund account,if there is a claim the commitee (APA) decide the amount per pilot,this of course does not completely replace the model, but it helps the hurt.
I hope this helps you ,Henry Hutchinson."

Interesting recourse for mid-air's, wondering if this could be applied here in the US and managed by the NSRCA Nationally or by District?