[okie01]

The sequence, I recall, was a.) transponder off, b.) hard left turn (executed under computer control, not pilot intervention) and c.) "Alright, good night", signing off as the flight left Malaysian ATC airspace.

This sequence doesn't correspond to Goodfellow's theory.

[Leroy S. Mort]

This sequence doesn't correspond to Goodfellow's theory.

Again, see post 20.

[exit82]

If the hard left turn was done under computer intervention, rather than pilot input, and it certainly was not in the flight plan to Beijing, then that makes a stronger argument for someone loading in new waypoints to the plane’s navigational system.