One expert said the search was like looking for "a needle in the sea". Above, the Vietnamese Air Force joins the effort. Photo: Reuters

A mystery at 35,000ft: What caused Malaysia Airlines flight to vanish into thin air?

Some experts claim a complete loss of contact suggests an explosion aboard flight MH370. Others say such a theory is 'almost impossible'

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One expert said the search was like looking for "a needle in the sea". Above, the Vietnamese Air Force joins the effort. Photo: Reuters
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