New Break in Hunt for Missing Plane?

Investigators have dramatically narrowed the focus of their search.
3:00 | 03/19/14

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Transcript for New Break in Hunt for Missing Plane?
We have some news in the search for the passenger plane that vanished 12 days ago. Tonight, the leading edge of the search has dramatically narrowed. Zeroing in on two sections of ocean. At this hour, the hunt is on. So, let's go straight to ABC's David Kerley at the map. David, show us the change and what we know tonight. Diane, a day and a half ago we were talking about a search area covering 1.25-square million nautical miles. Now, it's off Australia where officials are focusing. We learned that they have created two possible paths that go right through the Australian search area. And it basically cut the size of the search area, from the size of Texas, in half. These search planes have now narrowed their focus. Here they are. Two possible paths the Malaysia 777 might have taken. Ending, they think, off Australia. Why here? Because the hourly satellite pings from the jet have yielded far more clues than ever expected. And calculations by british and U.S. Experts have been handed over the Australians to help in the search. The area at the end of those analysis has been refined. By work done by the national transportation safety board on the fuel reserves on the aircraft and how far it could have flown. Reporter: The Australians have their aircraft concentrating around the two plot lines. And so is the u.s.'s new high-tech sub hunter, looking for wreckage in the vast areas. For the first time, the president spoke about the missing jetliner publicly. We have put every resource we have available at the disposal of the search process. There's been close cooperation with the Malaysian government. Reporter: Also tonight, the FBI has been asked to help in the investigation of the pilots. At least when it comes to the pilot's home simulator. Hi, everyone. Reporter: Waiting for a week to confiscate the simulator, Malaysian authorities say there were deleted files on the computer. So, the FBI is on the case, trying to recover those files. And this is a bit of a race because the batteries, Diane, in those black boxes only last 30 days. We already lost 12 days. David Kerley at our map tonight. And from the search deep in the sea to the depths of emotion

This transcript has been automatically generated and may not be 100% accurate.

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