> from time to time planes crash over ocean and search for black boxes may take years like Air France 447 ... Yes, and in that case, they knew within narrow li

> from time to time planes crash over ocean and search for black boxes may take years like Air France 447 ... Yes, and in that case, they knew within narrow limits where the plane went down -- the crew were doing what they could to let their position be known. No effort to sneak away with an airliner, as in the present case.