Parts supplier Spirit AeroSystems also affected after US regulators ground 737 Max 9s with door plugs
What caused the Boeing plane issue and what does it mean for the rest of the fleet?
Shares in Boeing, and the parts supplier Spirit AeroSystems, have fallen amid renewed fears over the safety of the aircraft manufacturer’s 737 Max planes after an Alaska Airlines flight was forced into an emergency landing on Friday.
Part of the jet’s fuselage that was ripped out in midair was found on Sunday in the back yard of a house in Portland, Oregon.