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Originally Posted by willravel
I have a question, Dil. Say you have a thousand blips on a screen any given day. Say that normally, all of them have transponder signals (so a number appears next to them). Say that this morning, three didn't send signals, meaning that on the screen there are three blips that are just blips, no numbers. As I understand it, air traffic controllers are responsible for no more than a few dozen planes at any given moment. Are you sure it would have been so difficult to find them?
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thats how it is now, however, on 9/11, there was no device in the tower that combined both methods of tracking the planes, radar and the transponder were handled on different floors, not just on different screens. the flight controller had to go up a flight of stairs to see the second view. that is why it was so hard to track the 3 that didn't have the transponders on them. NORAD was the same, sure they can track everything in the sky, but they are not designed to track commercial aircraft as airline flights, NORAD saw them as blips, not as airline flight numbers. the flights originated inside the US, so there was no threat as NORAD is designed to look for it, had it came from the ocean, or another country, they would have scrambled and intercepted immediately.
i think were getting some where now.