Boeing stock edged higher early Friday as investors slowly pieced together what happened to the 787 jet that crashed in India 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.