With the right equipment it is possible to take control of any electronic device, I won't tell you how for obvious reasons. Just because it it is in a jet doesn't make it immune. This is nothing new. And I don't expect criminals to launch a series of hi-jackings any time soon. You guys are intelligent and could probably figure out how to do it, but at the end of the day thats why two of you are sat up front and can turn off the auto pilot and fly the aircraft. It could happen but not if real people are the fail safe.
