Why would both engines of a state-of-the-art Boeing 787 Dreamliner lose power just seconds after takeoff, when everything appears to be okay? This is now the focus of an international investigation, after the disastrous crash of Air India Flight 171 on June 12,

A preliminary report on the investigation into the Air India flight that crashed last month has answered some questions about the fatal accident but raised many more and fuelled speculation about the cause.