Personally, I don't believe that a big piece of machinery could fly a quarter of the way around the earth without being detected by people whose job it is to detect potential threats. Either they are incompetent and useless, or there is a lot more to this story.

Unless this aircraft is at the bottom of the ocean within a few miles of the last confirmed location, this will be the most elegant act of skullduggery in human history. Worthy of Lex Luthor or Dr. Evil.

Good point Mimi. Should also point out that China is aligned with Russia over the Ukraine mess. That would be a good excuse to delay the trip.

They should probably enjoy some quality tome at camp David for a bit. If anything bad happened the congress and senate would finally get together to pass some truly nightmare stuff.

If the intent is to use the plane in a terrorist act it would have to happen soon. These folks have to know how many people are looking for this plane.

Well, since we are all in the conspiracy theory mood, I think it was a dry run to see if the plane could be controlled remotely.
I think it is risky to let the First Lady, and her children leave for China not knowing what is going on with this plane. They are suppose to leave today.

There is a U.S. Navy base in Diego Garcia (not Sergio Garcia).