Originally Posted by George O Well

"ANDERSON: They're probably not squawking anything [broadcasting a beacon code] anyway. I mean, obviously these guys are in the cockpit.
NASYPANY: These guys are smart.
UNIDENTIFIED MALE: Yeah, they knew exactly what they wanted to do."

>>>Knowing enough to turn off the transponder ain't exactly genius. It's only purpose is to locate and identify your aircraft. Still, I think Atta & Co. had inside help, possibly from a nefarious 'friendly' intelligence service.