So, theories as to what happened? Either something which incapacited the crew and left the plane on autopilot. Or suicide by one of the pilots or A.N.Other person...respectfully snipped...I'm as confused as I was in thread 1.
IF the plane really did crash off Australia, it will be important to know if it flew there under continuing human commands or was just flying blind. If blind for many hours, that suggests something or someone incapacitated all onboard early on.
Anything could have happened. Perhaps hijackers stormed the cockpit and demanded a diversion. But the pilots resist by either:
(1). Wild maneuvers that end up causing severe structural damage and blind flight...OR
(2). Ordered to attack a target, the pilots conned the hijackers by inputting a false heading out in the middle of nowhere to spare lives on the ground.
Of course, these theories are probably as wrong as 99% of all the other ones.