[notmytarga]

There are some interesting theories coming up. The best ones are supported by hard facts and aviation knowledge. And there has been a little overlap of those sources in the discussion.
Now - I THINK - that the passport issue might be overestimated by the public based on the other information brought up here. The passport problem is scary. But an explanation for the lack of communication while in the air still had me thinking of a hijacking. The pilots might be forced to stay off the comms or hijackers took control while directing the flight on new vectors once it is past ground radar - with simulated position data giving false vectors. Sophisticated and far fetched - but I had to throw my theory in the ring. I read too much Tom Clancy. I would be searching an area determined by last ground radar position and remaining fuel - a huge swath. Perhaps there are clues in the dis/continuity and background data (GPS type - satellites used) in the Avionics feed. I read this discussion expecting our aviation experts to have some answers - I think the smartest ones are holding their tongues.