OR
It could be FS screwing up a little. When you enter an area, FS spawns the AI aircraft in that area so that you don't have to have thousands of aircraft flying all over the world when you can't even see them.
So maybe FS caught a little drag, so to speak, and when that message came over the radio it kicked the program a little and all the AI that were supposed to be flying away from that area at that time were simultaneously popped up right there.
Or maybe its just a timewarp from the past . . . ever seen Donnie Darko?
