Originally Posted by Dilbert1234567

you still don't get it.

the jets WERE on radar, radar however does not identify a plane, all it shows is a blip on a map, maybe direction and speed. matching the blip to hijacked plane against a sea of other blips is near impossible. as i stated already, the traffic controller had to traverse a flight of stairs to get from the radar screen to the room that the transponders screen. the communication did not exist to quickly identify a hijacked plane with out its transponder on.