Boeing stock dropped on Wednesday as investors slowly pieced together what happened to the 787 jet that crashed in India almost a week ago.Investigations are focused on the engines and why the plane lost lift shortly after takeoff.

The crash of a Boeing 787 passenger jet in India minutes after takeoff on Thursday is the latest incident that adds to woes at the troubled U.S. planemaker.

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.