Investigators have recovered the cockpit voice recorder (CVR) from the crashed Air India flight, a key step in uncovering what caused last week's deadly accident. The London-bound Air India aircraft,

Investigators in India are studying the black boxes of a Boeing 787 Dreamliner after recovering them from the aircraft wreckage to ascertain the cause of last week's plane crash that left at least 270 people dead.

The ill-fated AI-171, which crashed in Ahmedabad last week, killing 274 people, was retired after the incident and replaced with AI-159.