Boeing stock was wavering 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.

Last year, the F.A.A. said it was also investigating claims by a Boeing engineer that parts of the fuselage, or body, of the Dreamliner were improperly fastened together, which the whistle-blower said could cause premature damage to the plane over years of use.

The crash could renew scrutiny of Boeing, which suffered a major blow to its reputation after 2018 and 2019 crashes involving its 737 Max planes.