A Chinese Ilyushin IL-76s aircraft touches down at Perth International Airport after returning from search operations for wreckage and debris of the missing Malaysia Airlines Flight MH370, in Perth, Australia, Monday, April 7, 2014. Underwater sounds detected by a ship searching the southern Indian Ocean for the missing Malaysia Airlines jet are consistent with the pings from aircraft black boxes, an Australian official said Monday, dubbing it "a most promising lead" in the monthlong hunt for the vanished plane. Angus Houston, the head of a joint agency coordinating the search, warned that it could take days to confirm whether the signals picked up by the Australian navy ship Ocean Shield are indeed from the black boxes that belonged to Flight 370, but called the discovery very encouraging. (AP Photo/Rob Griffith)
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