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.

An Air India flight from Ahmedabad to London has been canceled days after the fatal crash that killed 241 people on board. The canceled plane for was a Boeing 787-8 Dreamliner—the same type of aircraft as the one that crashed last week,

Air India has cancelled multiple flights over the past 72 hours, including seven on Tuesday alone. The development comes against the backdrop of the Director General of Civil Aviation (DGCA) ordering the airline to perform one-time safety checks.