[all4one]

At some point after 9/11, there were stories about GPS transponders that were found in buildings adjacent to the WTC area. They were somehow linked to the hijackers being able to redirect the planes to the correct coordinates to hit the buildings. I am sure that someone here at FR recalls this info., or has articles from that time that back-up my recollection.

[Ashamed Canadian]

If that's the case, then I find that astonishing. That would indicate an operation of a much more colossal scale than I would've thought. I always thought it was a crude attack with the box cutters being their only tool.

[Fudd]

...GPS transponders that were found in buildings adjacent to the WTC area. They were somehow linked to the hijackers being able to redirect the planes to the correct coordinates to hit the buildings...

I thought it was the CAVU - They could probably see where the buildings were from 60 miles out.