The best speculation I read, though I forget the exact source, was one of a cockpit electrical fire which took out communications first. Then, while the pilots were pulling breakers to remove the ignition source energy and accidentally shutting down the transponder, they succumbed to toxic combustion gasses. The passengers were lost to the toxic atmosphere next. The autopilot ran the plane out of fuel and it crashed.
The two minute turn back toward the originating airport could have been executed by the pilots before they succumbed.
The two minute turn back toward the originating airport could have been executed by the pilots before they succumbed.
So how, exactly, does God know that She's NOT a brain in a vat? 
