This shadow of a Royal New Zealand Air Force P3 Orion aircraft is seen on low cloud cover while it searches for missing Malaysia Airlines flight MH370, over the Indian Ocean on March 31, 2014. No time limit will be imposed on the search for MH370 because the world deserves to know what happened, Australian Prime MinisterTony Abbott said, as a ship equipped to locate the plane&#039;s &quot;black box&quot; prepared to set sail. (Rob Griffith/AFP/Getty Images)