Excellent work by the AAIB. So we now know the aircraft flew at steady speed and altitude until the fuel ran out in the Southern Indian Ocean. That should at least put paid to all the posts relating to Lithium battery fires, flying under the radar and deliberate attempts to kill everyone by hypoxia/anoxia. The most obvious conclusion is that someone was in control of the plane until it crashed. Clearly the anti hijack door functioned exactly as advertised and prevented anyone from entering the cockpit once the course to the Southern Indian Ocean had been set. A tribute to the cockpit security system installed on this aircraft.