Don’t these aircraft have emergency radio beacons? No one has picked it up yet?
http://www.freerepublic.com/focus/f-news/3131103/posts
The above link has statements to the media directly from Malaysia Airlines. I don’t know if your question is addressed.
“Don’t these aircraft have emergency radio beacons?”
They do but there’s no telling if it was released and not tangled in the wreckage if the plane crashed or that it survived. They’re durable devices but not like a black box.