The Search for Flight MH370

A relative of Chinese passengers aboard Flight MH370 takes a nap against the wall displaying messages of wishes for the passengers during a briefing held by Malaysia officials at a hotel in Beijing, April 11, 2014.

A woman, the daughter of a Chinese passenger on Flight MH370 shows her mobile phone displaying a photo of her father near the wall displaying messages of wishes for the passengers at a hotel in Beijing, April 11, 2014.

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Spectators take photos of a Chinese Ilyushin IL-76 aircraft as it comes in for a landing at Perth International Airport after returning from the ongoing search operations for missing Malaysia Airlines Flight 370, Perth, Australia, April 10, 2014.

A man places a candle on top of a white board set up to place messages for passengers on Flight MH370 during a candlelight vigil in Kuala Lumpur, April 6, 2014.

People place candles on a banner reading, "Pray for MH370" after a special prayer for passengers onboard the missing plane at the Malaysian Chinese Association headquarters in Kuala Lumpur, April 6, 2014.

A U.S. Navy towed pinger locator is pictured on a dock at HMAS Stirling naval base near Perth.

Chinese patrol ship Haixun 01 is pictured during a search for Flight MH370, in the south Indian Ocean, April 5, 2014. (CNS photo)

The Bluefin 21, an Artemis autonomous underwater vehicle, is hoisted back on board the Australian Defence Vessel Ocean Shield after a successful buoyancy test in the southern Indian Ocean, April 4, 2014.

A flight lieutenant monitors a TAC station onboard a Royal New Zealand Air Force P3 Orion during search operations for Flight MH370 in the southern Indian Ocean, April 4, 2014.