2000-2001: Official Reports of Unexplained Airliner Transponder Jamming, Military Exercises A Suspected Cause

Just prior to the September 11 attacks – between November 2000 and April 2001 – French aviation authorities noted and investigated repeated instances of unexplained commercial airliner Mode S transponder jamming resulting in the loss of secondary radar data to Air Traffic Control (ATC). Affected aircraft included Air France Boeing 767s.

http://www.icasc.co/sites/faa/uploads/documents/resources/12th_int_flight_inspection_symposium/Transponder_Jamming.doc

Three of the four reportedly hijacked September 11 flights also stopped providing secondary radar data to ATC via Mode S transponders during their flights. These Mode S transponder data losses were officially attributed to manual deactivations by alleged hijackers, although evidence to confirm this claim was never cited by the 9/11 Commission Report. September 11 flight transponder data losses contributed significantly to a circumstantial impression of alleged hijacker flight deck takeovers and also coincided with significant nationwide US military exercises that day.

http://911blogger.com/news/2011-12-29/implications-september-11-flight-transponder-signal-losses

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