The image here
http://i57.tinypic.com/2e1txty.jpg shows all the known ,military classified satellites to the north of MH370 at around 1820 GMT....most are geostationary.
I have factored in an altitude of 35000 feet.
If you strip out all the debris , rocket bodies and decommissioned birds you are still left with a lot of active platforms.
These satellites have both eyes and ears on this region.
If recent revelations are to be believed they are not just looking/listening to specifics , but sucking up data on everything 24/7
So , who is not coming forward with what they have I wonder ?