[Red Badger]

Possibly, but what accounts for the transponder and other comm equipment being turned off?......

[jimbo123]

The 9/11 hijackers turned off the transponders.

American Airlines Flight 11

8:19 Flight attendant notifies AA of hijacking
8:21 Transponder is turned off

United Airlines Flight 175

8:42-8:46 Likely takeover
8:47 Transponder code changes

American Airlines Flight 77

8:54 Flight 77 makes unauthorized turn to south
8:56 Transponder is turned off

United Airlines Flight 93

9:36 Flight attendant notifies UA of hijacking;UA attempts to contact the cockpit
9:41 Transponder is turned off

http://www.9-11commission.gov/report/911Report_Ch1.htm