All but one of the 242 souls aboard the Boeing Dreamliner 787 perished in the crash, and more than three dozen were killed on the ground.

Both flight data and cockpit voice recordings are crucial to piece together the sequence of events that led to the fatal crash.

It’s also the latest disaster to hit the beleaguered American aerospace giant — which has been dogged by a door that blew off a 737 jet, a leaky spacecraft that stranded astronauts on the International Space Station for months, as well as politically damaging delays in outfitting the new Air Force One jets.

The investigation into Air India flight 171 crash opens up questions into the many concerns surrounding Boeing's 787.

The accident happened just weeks after the company cut a deal with the U.S. government to avoid taking criminal responsibility for a pair of deadly crashes in 2018 and 2019.