India's Aircraft Accident Investigation Bureau (AAIB) is yet to decide whether flight data and cockpit voice recorders from the Air India flight that crashed last Thursday will be sent overseas for decoding and analysis.

The preliminary finding gives investigators a new line of inquiry as they study a crash that killed all but one of the plane’s passengers.

Air India faces fresh turbulence following last week’s fatal crash as additional safety inspections on its Dreamliner fleet lead to flight delays, cancellations and growing passenger anxiety