Is there a way that someone could be "at fault" for causing a mid-air collision? I guess if someone called "landing" and someone strayed into the landing pattern.....

But what about two planes that collide way out in the flying area? My 27% Extra 330 recently fell victim to just that......head on with a 1/4 scale Futana. The Futana sliced right through the middle 1/3 of my right wing......that piece AND the servo is still missing. Here's the picture of my airplane....

It just seems to me that no one could really be at fault. Ironically there were only two aircraft in the air at the time.
PT