pb, the thing that many of those affected tend to not understand that although today aircraft are taken off route as Gonzo explains, there is nothing to stop any route being flown exactly as published by every aircraft that files it and causing the exact same noise problems that the RNAV trials created. This means that the routes that are there today could be left as they are, and everything else around them could move to make the route tracking become more accurate more of the time. That is completely hypothetical as the routes as they are currently will need moving to fit any RNAV vs Holding plan, but is still a thought to keep at the back of your mind.