Alpine Flyer,
I agree.
Trying to repeat the WTC scenario would be stupid.... there are better ways (from their point of view).... but then sometimes people ARE stupid.
But just maybe, if you saw an airliner squawking the hijack code, not answering any comm, and in a shallow dive heading for the centre of Jerusalem, maybe even you would put four Sidewinders up the tailpipes first, and ask questions afterwards?