Im lester holt sitting in tonight for brian. A stunning new revelation in the search for that missing malaysian jetliner is throwing a lot into question tonight, from the area being searched to what possibly could have been going on inside the cockpit. It now aheres that the 777 continued flying for hours after it vanished from radar. We know that, sources say, because the plane was transmitting discreet automated signals after the controllers lost sight of it on their radar screens. Its a puzzling clue that vastly expands the possibilities of where the plane ended up, and it leaves some experts to wonder aloud if this plane might have vanished because somebody wanted it to. Nbcs tom costello continues to lead our coverage. He joins me thou with the very latest. Tom, explain to me what these signals are. Reporter yeah, they are described as pings, and also described to us as a wireless route theyre stays on even when youre not really surfing the internet, transmit organize not transmit