The good ol’ BBC has published a piece that lists all of the possible scenarios for MH370. http://www.bbc.com/news/magazine-26609687. Some it shoots down in flames, some it leaves open; it’s a very good and complete summary. One possibility I hadn’t really considered but one that is now looking feasible is that was shot down and whoever did it is keeping stumm. Actually, this is exactly the scenario I set out in my novel Flight Into Darkness (http://getBook.at/FlightIntoDarkness):
#MH370 All the possibilities in one place – thanks BBC!