A Malaysia Airlines crew member inspects an airplane at Kuala Lumpur International Airport on Thursday. The carrier announced it was laying off a third of its workforce amid steep financial losses. Azhar Rahim/EPA/Landov hide caption

itoggle caption Azhar Rahim/EPA/Landov

The Australian ship Ocean Shield, seen here earlier this month, has been ordered back to its dock, after a search for the black boxes of a missing Malaysian airliner ended without finding anything. Paul Kane/Getty Images hide caption

itoggle caption Paul Kane/Getty Images

Angus Houston displays a map of the search area for missing Malaysia Airlines flight MH370 Monday. Houston says an Australian navy ship has detected underwater signals consistent with aircraft black boxes, calling it the "most promising lead" so far in the month-old search. AFP/AFP/Getty Images hide caption

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Angus Houston, head of the Joint Agency Coordination Center leading the search for missing Malaysia Airlines flight MH370, says ships are being sent to investigate reports of a signal being detected on a frequency used by black box equipment. Tony Ashby/AFP/Getty Images hide caption

itoggle caption Tony Ashby/AFP/Getty Images

A map shows the location of a pulse signal that was reportedly detected by a Chinese patrol ship searching for Malaysia Airlines flight MH370. China's state-run media says the signal is being investigated as a possible clue to the missing airliner's final location. Google Maps hide caption

itoggle caption Google Maps

Newly arrived Chinese relatives of passengers of the missing Malaysia Airlines flight MH370 hold banners while talking to reporters at a hotel in Malaysia Sunday. The search continues for the jetliner that went missing three weeks ago. Aaron Favila/AP hide caption

itoggle caption Aaron Favila/AP

Crew members on the Chinese icebreaker Xue Long scanned the southern Indian Ocean on Wednesday as they assisted in the search for Malaysia Airlines Flight 370. Earlier this year, the Xue Long assisted in the rescue of more than 50 scientists and paying passengers from a ship that got stuck in the Antarctic Ocean. Zhang Jiansong/Xinhua/Landov hide caption

itoggle caption Zhang Jiansong/Xinhua/Landov

Satellite imagery provided to the Australian Maritime Safety Authority of objects that may be possible debris of the missing Malaysia Airlines Flight MH370. Australian Maritime Safety Authority hide caption

itoggle caption Australian Maritime Safety Authority

Relatives of Chinese passengers from the missing Malaysia Airlines flight MH370 met officials at a Beijing hotel Sunday. The flight disappeared from radar more than a week ago. Mark Ralston/AFP/Getty Images hide caption

itoggle caption Mark Ralston/AFP/Getty Images

A woman, believed to be the relative of a passenger onboard Malaysia Airlines flight MH370, cries as she talks on her mobile phone at the Beijing Capital International Airport in Beijing. Kim Kyung-Hoon/Reuters /Landov hide caption

itoggle caption Kim Kyung-Hoon/Reuters /Landov