Originally Posted by
Ftrooppilot
Pilot left cockpit to visit restroom. Radicalized FO locks the door and says "my airplane, " pulls CBs, turns off switches and goes about his "thing" - whatever was planned.
This. FO is suspect number one. Only someone possessing the knowledge of how to make an aircraft go dark to the rest of the world could have pulled this off. I can't state this with certainty, but I don't think a hijacker/terrorist has made it past the cabin door since 9/11, and don't see it happening on this flight. If they did, I doubt they would know how to disable the ACARS, transponder, and anything else that could be used to track a 777. I don't suspect the captain, since he had been flying since 1981. Investigators need to start digging into the FO's background for signs of radicalism ASAP.