US officials now believe the plane may have been stolen
"with the intention of using it later for another purpose." They also say an engine communications system on the plane was pinging a satellite for 4-5 hours after it went missing, which pretty much rules out a crash at sea.
http://online.wsj.com/news/articles/...34653903086282
But Malaysia says the engine did not continue communicating with the satellite....
http://www.dailymail.co.uk/news/arti...formation.html