I think it was a hijacking. Probley by the pilot. It could have crashed in the ocean with passengers fighting the pilot. Nothing else makes as much sense. My guess is things were disabled by the pilot, he flew it high as possible suffocating the passengers and made for Pakistan. Hope he didn't make it. Sound too far fetched? You dont have to look any farther than 9-11. Hope I am wrong. With every senerio there are questions like why didnt any of the passengers try calling home? Hard to do when you are screaming for a gulp of air.
Why didnt the pilot just steal a empty aircraft? Why has there been no ransom demands or bragging? No matter what theory we come up with there is factors that seem to negate that theory.
If he DID make it to a terror base, we are in obvious trouble. There is much out there that points to the pilot. The home computer set up, Muslim, his just attending that trial, his ability to turn off the transponder, calling the controller AFTER he turned the plane back etc. Now the question is did the plane land intact? I fear it did.