I am thinking that they just had some sort of mechanical/electrical failure and dropped off radar and then had to fly really low for quite awhile to desperately keep the plane in the air. from what i read this morning that seems to be sort of backed up in that they were flying lower on the last military radar transmission.

I really feel for the families and friends left behind and it just makes you feel so sad to think that it probably didnt go down all that quickly. And of course we know that there were infants on board, but there also would of been children...as a parent it really hits home how intense it must of been for them all.