Of miles from where their aircraft disappeared. military ships and aircraft from more than half a dozen countries are now engaged in the search including two u.s. warships. joining me now, former ntsb investigator, greg feiff. greg, i think for a people watching this, the big question is, how is it possible in this day and age for an airliner to disappear out of thin air? >> it is hard to imagine, chris, but in that part of the world, radar coverage is very scant and parts of it is unavailable. so pilots are reporting their process across certain tracks. if you have an airplane that falls belo...