Fireflybob - it doesn't take a high school kid a second to think these things up, just go and look at a few films or read a comic. If we stop discussing these things, again they have won.
There seem to be some very strange ideas about what a light aircraft can do. Having spent a couple of hours chasing another light aircraft, only 50m away in the same type, I can tell you that hitting an airliner is harder than you think. All you have to do is miss and the disaster is averted. However the lighty is likely to be flipped about by wake or even break up and the heavy won't even notice. If they DID manage to get right in the way at the wrong time they would have to be extremely lucky and still they wouldn't have much of a chance, although theoretically it could be pretty bad.
I am more worried about the fireworks around November having been almost hit last year, and the police being utterly useless.