play. with a search grid of 2 million square nautical miles, malaysia is relying on other countries. a huge portion of the yar is in the southern indian ocean, southwest of australia where american aircraft are combing through rough waters for any sign of debris. the area is just too big for underwater sonar. much of the focus remains on the pilot and first officers. first officer, i may. the officials say nothing suspicious turned up in homes of either men. so we begin there. and then we try to branch out, just like investigators are. joining us now, former senior air safety investigator with the national transportation and safety board, greg feith. greg, i guess the biggest development is knowing this was planned in the 12 minutes before the u-turn. what does that tell us, and what does it not tell us? >> well, i think you characterize it right, mika. the problem is that pilots will typically put an alternate