[quote="Captain Bunny":07b7a][quote=ninty9] Too many witnesses and information from norad and other radar sites would ahve shown it. I doubt it was shot down.
.[/quote]

Well, according to a government statement, the terrorists who hi-jacked the one that hit the pentagon switched off some radar stuff or whatever, and so it couldnt be tracked. maybe same could have happened to 93.
ohh, to add to my original post, the eyewitness said it was a twin engine, with a spoiler (like off a car) connecting 2 tail fins. she said she looked it up on the net but couldnt find a match, she said it was flying very low. the fbi when they changed their story, said it was flying at 3000ft. hmm

ohh, and this in an interesting read.

[url="http://www.everything2.com/index.pl?lastnode_id=388856&node_id=1157682"]http://www.everything2.com/index.pl?las ... id=1157682[/url][/quote:07b7a]

transponder, every civilian jetliner has one, it transmits the flight number, etc. that shows up on air traffic control radar, sort of like an ID tag that sends messages.