A crew member looks out through an observation window aboard a Royal New Zealand Air Force (RNZAF) P3 Orion maritime search aircraft as it flies over the southern Indian Ocean looking for debris from missing Malaysian Airlines flight MH370 on April 11. Search and rescue officials in Australia are confident they know the approximate position of the black box recorders from missing Malaysia Airlines Flight MH370, Australian Prime Minister Tony Abbott said. At the same time, however, the head of the agency coordinating the search said that the latest "ping" signal, which was captured by a listening device buoy on Thursday, was not related to the plane. Reuters/Richard Polden