Hypoxia may have affected the passenger cabin as it is known the plane went above 45,000 ft.
If this was a planned takeover, the cockpit would have prepared for it.
My guess is that plane is down in Indonesia somewhere.
The United States will NEVER share her military knowledge to where this plane is without a joint international assessment.
So the climb to 45,000ft would have been done to cause the Hypoxia?