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.

Air India's inspection of the locking feature on the fuel control switches of its existing Boeing 787 aircraft found no issues, an internal communication circulated within the airline said."Over the weekend,

The captain of the doomed Air India flight that killed more than 200 people last month, gave control of the plane to his first officer before takeoff, according to sources citing cockpit recordings from the recovered black boxes.