Major Development In Search For MH370 May Lead To Black Box

PERTH, AUSTRALIA - APRIL 07: Air Chief Marshal Angus Houston (ret'd) addresses the media during a press conference for the continuing search of missing Malaysia Airlines Flight MH370 at Dumas House on April 7, 2014 in Perth, Australia. Angus Houston confirmed today that the Australian naval vessel Ocean Shield has twice detected signals in the past 24 hours consitent with aircraft black boxes. The airliner disappeared on March 8 with 239 passengers and crew on board and is suspected to have crashed into the southern Indian Ocean. (Photo by Paul Kane/Getty Images)