MH370

A family member of a passenger onboard the missing Malaysia Airlines Flight MH370 cries as she gathers with others to pray at  Yonghegong Lama Temple in Beijing

Kim Kyung-Hoon/Reuters

A family member of a passenger on the missing Malaysia Airlines Flight MH370 cries as she gathers with others to pray at Yonghegong Lama Temple in Beijing. It has been six months since the aircraft, with 239 people in board, disappeared on a flight from Kuala Lumpur to Beijing.

In this April 9, 2014 photo provided by the Australian Defense Force, a Royal Australian Air Force AP-3C Orion flies past Australian Defense vessel Ocean Shield on a mission to drop sonar buoys to assist in the acoustic search of the missing Malaysia Airlines Flight 370 in the southern Indian Ocean. The ship searching for the missing Malaysian jet has detected two more underwater signals that may be emanating from the aircraft's black boxes, and the Australian official in charge of the search expressed hope Wednesday that the plane's wreckage will soon be found.

Australian Defense Force/AP

A Royal Australian Air Force AP-3C Orion flies past Australian defense vessel Ocean Shield on a mission to drop sonar buoys to assist in the acoustic search for the missing Malaysia Airlines Flight 370 in the southern Indian Ocean

High school students hold candles during a vigil for passengers of the missing Malaysia Airline flight MH370 in Lianyungang, east China's Jiangsu province on March 25, 2014. Scores of angry relatives of the Chinese passengers aboard Flight MH370 set out on a protest march to the Malaysian embassy in Beijing on March 25 to demand more answers about the crashed plane's fate.

AFP

High school students attend a vigil for passengers of the missing Malaysia Airline flight MH370 in Lianyungang in east China’s Jiangsu province. Scores of angry relatives of the Chinese passengers aboard the flight set out on a protest march to the Malaysian embassy in Beijing on Tuesday to demand more answers about the crashed plane’s fate.

A relative (C) of passengers on Malaysia...A relative (C) of passengers on Malaysia Airlines flight MH370 cries after hearing the news that the plane plunged into Indian Ocean at a hotel in Beijing on March 24, 2014.  The missing Malaysia Airlines jet came down in the Indian Ocean, Prime Minister Najib Razak said March 24, as the airline reportedly told relatives it had been lost and that none on board survived. AFP PHOTO / GOH CHAI HINGOH CHAI HIN/AFP/Getty Images

Goh Chai Hingoh/AFP

A relative of passengers on Malaysia Airlines flight MH370 cries after hearing the news that the plane plunged into Indian Ocean at a hotel in Beijing. The missing Malaysia Airlines jet came down in the Indian Ocean, Prime Minister Najib Razak as the airline reportedly told relatives it had been lost and that none on board survived. Read more

A ground controller guides a Royal Australian Air Force AP-3C Orion to rest after sunset upon its return from a search for the missing Malaysia Airlines flight MH370 over the Indian Ocean, at the Royal Australian Air Force base Pearce in Perth, Monday, March 24, 2014. Satellite images released by Australia and China had earlier identified possible debris in an area that may be linked to the disappearance of the flight on March 8 with 239 people aboard.

Jason Reed/AP

A ground controller guides a Royal Australian Air Force AP-3C Orion to rest in Perth after sunset upon its return from searching for the missing Malaysia Airlines flight MH370 over the Indian Ocean. Satellite images released by Australia and China had identified possible debris in an area where the flight may have disappeared on March 8 with 239 people aboard.

An artwork by Malaysian artist Safirah Rashid is seen at the Wall of Hope for the passengers of the missing Malaysian Airlines plane at Kuala Lumpur International Airport, Malaysia, 17 March 2014. China sharply criticized Malaysia for its handling of an investigation into the disappearance of a commercial aircraft with 239 people aboard nine days ago. The criticism came as a Malaysian police source ruled out a connection between the pilot's political affiliations and the disappearance of Malaysia Airlines flight MH 370.

Ahmad Yusni/EPA

An artwork by Malaysian artist Safirah Rashid is seen on the Wall of Hope for the passengers of the missing Malaysian Airlines MH370 aeroplane at Kuala Lumpur International Airport

KUALA LUMPUR, MALAYSIA - MARCH 14:  Members of the public, MAS staff, and politicians pray during a special prayer as the search for missing Malaysian airline MH370 expands to the Indian Ocean March 14, 2014 in Kuala Lumpur, Malaysia. The missing aircraft carrying 227 passengers and 12 crew disappeared six days ago baffling the international rescue and search team who have found no remains or clues in the waters surrounding South East Asia. All passengers and crew are currently under investigation for possible sabotage although no evidence of such activity has been found.

Rahman Roslan/Getty

Members of the public, Malaysia Airlines staff and politicians in Kuala Lumpur, Malaysia, pray for missing flight MH370 as the search expands to the Indian Ocean . The aircraft carrying 227 passengers and 12 crew disappeared six days ago baffling the international rescue and search team who have found no remains or clues in the waters surrounding southeast Asia Read more

Malaysia's police chief, Inspector General Khalid Abu Bakar, addresses a news conference on the two passengers who had travelled onboard the missing Malaysia Airlines MH370 plane on stolen passports in Kuala Lumpur International Airport...Malaysia's police chief, Inspector General Khalid Abu Bakar (C), addresses a news conference on the two passengers who had travelled onboard the missing Malaysia Airlines MH370 plane on stolen passports in Kuala Lumpur International Airport March 11, 2014. Malaysia's police chief said on Tuesday that one of the two men holding false passports who boarded the Malaysian airliner that vanished last week was an Iranian national. The identity of the other man was being investigated, Inspector General Khalid Abu Bakar told a news conference.REUTERS/Edgar Su (MALAYSIA - Tags: DISASTER TRANSPORT)

Edgar Su/Reuters

Malaysia’s police chief, Inspector General Khalid Abu Bakar (centre), addresses a news conference in Kuala Lumpur on Tuesday concerning the two passengers who had travelled on board the missing Malaysia Airlines MH370 plane on stolen passports. He said that one of the two men who boarded the airliner that vanished last week was an Iranian national. The identity of the other man was still being investigated. Read more