International air crews involved in the search for the missing Malaysia Airlines plane gathered Tuesday on the tarmac at the Royal Australian Air Force Pierce Base in Bullsbrook, near Perth. Reuters/Landov hide caption

itoggle caption Reuters/Landov

Ships continued to search for Malaysia Airlines Flight 370 on Wednesday. They were looking in an area about 1,000 miles northwest of Perth. Ocean Shield is an Australian ship that has been looking for the jet's black boxes. Australian Maritime Safety Authority hide caption

itoggle caption Australian Maritime Safety Authority

The U.S. Navy's Bluefin-21 Artemis autonomous underwater vehicle as it was being hoisted on board the Australian Navy vessel Ocean Shield earlier this month. The Bluefin is being deployed to map the sea floor in the area of the southern Indian Ocean where the search for Malaysia Airlines Flight 370 is concentrated. It will look for any sign of the missing jet. MC1 Peter D. Blair/U.S. Navy hide caption

itoggle caption MC1 Peter D. Blair/U.S. Navy

Remembrance poppies honoring veterans cover a shrine in Wellington, New Zealand, on a recent April 25, when Australia and New Zealand mark ANZAC Day. A new campaign urges people to buy a minute of silence to support veterans. Hagen Hopkins/Getty Images hide caption

itoggle caption Hagen Hopkins/Getty Images

Sgt. Trent Wyatt looks out an observation window on Friday from aboard a Royal New Zealand air force P-3 Orion maritime search aircraft as it flies over the southern Indian Ocean. So far there's been no sign of Malaysian Airlines Flight 370. But officials are hoping that sounds detected below the surface are coming from one or both of the plane's black boxes. Richard Wainwright/Reuters/Landov hide caption

itoggle caption Richard Wainwright/Reuters/Landov

A Republic of Korea P-3 Orion aircraft takes off from the Royal Australian Air Force (RAAF) Base Pearce during the search for the missing Malaysia Airlines jet near Perth late last month. Jason Reed/Reuters/Landov hide caption

itoggle caption Jason Reed/Reuters/Landov

Relatives of passengers of the missing Malaysia Airlines flight MH370 embrace each other in a Beijing hotel after learning of news today that the flight ended in the southern Indian Ocean. Rolex Dela Pena/EPA/Landov hide caption

itoggle caption Rolex Dela Pena/EPA/Landov

Chinese relatives of the passengers onboard Malaysia Airlines flight MH370 wait for the latest information at Lido Hotel Sunday in Beijing, China. Lintao Zhang/Getty Images hide caption

itoggle caption Lintao Zhang/Getty Images

This satellite image, taken on March 18, has intensified the search for Malaysia Airlines Flight 370 in the Indian Ocean about 1,500 miles southwest of Perth, Australia. The image was released Saturday by Chinese authorities. /Reuters/Landov hide caption

itoggle caption /Reuters/Landov

Searching from the air and on the sea: The view Friday from a Royal Australian Air Force P-3 Orion. The Norwegian car transport ship Hoegh St. Petersburg is below. They're part of the search in the southern Indian Ocean for Malaysia Airlines Flight 370. Justin Benson-Cooper/pool/EPA/Landov hide caption

itoggle caption Justin Benson-Cooper/pool/EPA/Landov