>> well, krchris mclaughlin fro inmarsat, his words were they knew roughly the area the aircraft is andhat might be the best clue as to where the black boxes will be. that's the flight deck recorder and cockpit voice recorder. without which we are a very long way from working out what happened in this highly unusual accident. >> but now we know the plane continued to fly for six or seven hours, made this very lengthy trip along that southern arc. as we start to piece together this investigation, are we looking at some kind of catastrophic event on board or is this more of a criminal investigation? >> well, first let me say i'm not absolutely clear that the aircraft actually flew along that arc or that that arc was the delineated a point on which the aircraft ended up. so two different things. the aircraft most probably flew in a straight line from its last turning point somewhere over the sea. are we any closer to finding it? i would feel more comfortable about confidence that this is, in fact, where the aircraft ended when they pick up some of the debris off the ocean. but how it got t