777s do not simply disintegrate at high altitudes. They are tested to be able to withstand severe conditions. Since it looks like they tried to turn around and there was a 12 mile long oil slick spotted, I can see the following series of events occurring: 1. No distress call was made and the plane lost contact after two hours. Communications failure. 2. The origin was closer than the destination so they attempted to turn around. 3. At this point, one of two things happened.       A. They banked too hard and generated high G force on the craft causing it to break apart, wings first.       B. There was more to the communications failure i.e a full electrical failure causing them to bank uncontrollably and go into a barrel roll.         A 777 is not designed for this and would break apart. 4. The plane left a 12-mile long oil slick as it descended rapidly. The pilots may have lowered the landing gear in an attempt to stop the barrel roll if they still had control. This could easily explain the oil slick. 5. Cabin pressure would have decreased rapidly, killing all 239 souls on board. 7. The hull should have remained intact but given it's uncontrolled speed, would have sunk very deep making the wreckage difficult to locate.