It is the responsibility of the Malaysian Government, under Annex 13 of the international aviation treaty arrangements to investigate the cause of MH370's disappearance.
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According to CNN, investigators from Boeing — the plane's manufacturer — conducted a photo assessment of the wreckage and were able confirm an indentification number that corresponds with a Boeing 777 part.
In 2014 all the families of passengers and crew on board MH370 were offered interim payments of US$50,000, non-conditional and regardless of any legal action, which some accepted. But as the third anniversary of the disappearance of the plane nears, no other resolution seems in sight.
In the case of MH370, the authorities believe that the primary transponder was turned off, and the backup didn't activate. In any case, once an aircraft is more than 240km (150 miles) out to sea, radar coverage fades and air crew keep in touch with air traffic control and other aircraft using high-frequency radio.
Friends of Zaharie Ahmad Shah, who was the captain of MH370, told The Atlantic that the 53-year-old pilot was depressed and lonely, engaged in one-sided flirting with young women on Facebook, and spent much of his non-flying time pacing empty rooms inside his home.