CNN At This Hour With Berman and Michaela April 21, 2014 15:06:00
Hour? >> reporter: hi, this is a really critical few next few days in this search operation. they're looking at the place which basically representing their best guess to find the black box based on exhaustive analysis of that -- those acoustics detections, the second in particular picked up american operated towed pinger locater. it was the stronger of the four. so what they're doing now is they're searching a six-mile radius around that point. and officials say that as of this morning, there are about two thirds of the way through searching this narrowed search area, not clear how much groun...
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