I was on a commercial flight about a year ago and looking out the window. Below us was a smaller plane (business jet maybe) that based on its relative size had to be several thousand feet away. I had no trouble at all seeing it or tracking it.
Heh. Thing is, you don't know how many others you missed!
A year or two ago I was at an AOPA seminar. One of the speakers was an air traffic controller who was also a pilot. She said that when she took her non-pilot co-workers for a ride, the thing they all mentioned was how difficult it is to see another plane in the air. If you know where to look (as you would if you were at an airport), or if you just happen to catch sight of one, it's not so difficult to keep in view. But finding one in the first place, unless it's airliner-size, isn't easy.
Didn't mean to hijack the OP's point that he just wants GVs to be left alone, or at least to be harder to find. I tend to agree with him that planes had difficulty locating GVs that were off-road (i.e. where the pilot wouldn't know to look). It would suit me fine to let the GV people have their own ground war, except that they keep intruding on airfields and shooting at planes. Until there's a way to deal with that sort of griefing, I think GVs should all have large blinking purple icons when they're within one mile of an opponent's airfield.
- oldman