"There are a number of troubles with that theory Charles, one of which is that the plane should have followed its intended course and stayed on radar by passive reflection, but it is certainly also one of my favourite theories right now.
The lack of debris near where it disappeared from the radar opens the door to more "interesting" theories, such as kidnapping or theft.
First of all, identifying planes by transponder code is not hard ID.
It would be perfectly possible for co-conspirator plane to fly transponder-less up to the target plane, take over the transponder code, and fly decoy on the official route, while the MH370 goes elsewhere.
That means that the point of "last contact" doesn't tell us anything but the existence of an electronic device acting like a transponder at that time and place.
Turning the transponder off and tailing another transpondered plane very closely is another way to disappear from ATC without plastering the surface with debris and then you are also more or less free to go wherever you want, until somebody visually spots two planes very close.
The decoy plane does not need to be the same size, so the probability of such visual detection would be low.
Therefore, suspecting foul play, we don't have any trustworthy information about the planes whereabouts after the last visual sighting of the plane.
It would be interesting to know if there were any high-value targets on that plane, amongst the passengers or in the cargo.
If the cargo was the interesting bit, killing off all the passengers by dropping pressure and oxygen is trivial.
One interesting nugget is the rumour that "passengers phones are still ringing".
That's sufficiently implausible that nobody would take it seriously and actually follow the SS7 data.
But if true, it would be explained by the plane sitting somewhere at the edge of a jungle, for instance on the remains of an old WW2 strip, passengers dead, and cargo gone."