was nefarious or mechanical it happened as a result of that transponder and that acars getting shut off. >> what is clear now, the captain was the last person on the jet, not his co-pilot, to speak to air traffic controllers, telling them good night, malaysian flight 370. the sources say there was nothing unusual about his voice which portrayed no indication he was under stress and no third voice is heard. and just today, more than a month after the flight disappeared, we're learning malaysian air force search aircraft were dispatched soon after the airline reported its plane missing. malaysian sources told cnn heading for the strait of malacca and the south china sea, malaysian authorities first concentrated their search on the south china say. there were indications that the