Boeing and the Federal Aviation Administration issued technical instructions to airlines two days after a part of a plane was blown out near Portland, Ore.
The aircraft maker and a key supplier of parts were punished in the markets after a chunk of a plane’s fuselage blew out on an Alaska Airlines flight.
Two days after a chunk of the fuselage blew out of one of the planes, the F.A.A. and the aircraft maker are still negotiating what to tell the airlines to do.