tracts of land, as well as deep and remote oceans. and jim, this search is now looking at some of the deepest places on the planet. under the ocean. plus some of the highest places. the himalayas. by land and by sea and some pretty big chunks of land and sea. thanks very much to andrew stephens. live for us in kuala lumpur. joining me now to discuss these developments, we have arthur rosenberg, aviation lawyer, engineer and pilot and a professor of aeronautics at m.i.t. and a former director assistant director of the fbi. john, i wonder if i could start with you. we have a lot of new information over the last 24 hours about the potential of a pilot s involvement in this. that it was a deliberate act. that it required turning off systems. radar indications of a steep ascent and decent. and flying through radar zones to avoid radar. that requires a level of skill. i wonder with what you know,