The Boeing 787-8 models faced repeated scrutiny over safety and production practices. From John Barnett to Salehpour, Boeing whistleblowers had already warned of 787 Dreamliner concerns

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.