Quote:
Originally Posted by lazypucker
Can the transponder and other communication devices be manually turn off, as in the case of the plane being hijacked?
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Yep, but again you'd still show up on primary radar (just a blip on the screen... no altitude, no identifer, no speed)
On the 9/11 tapes you can hear the controllers asking other aircraft what the hijacked planes were doing and how high they were because the hijackers nuked the transponders, but controllers could still see roughly where the plane was.