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,

Boeing was generating optimism. Then on Thursday a 787 crashed, raising the specter of fresh problems for Boeing and altering the message it planned to send.