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.
Alaska Airlines restricted the use of the plane, which lost part of its fuselage on Friday, because of a warning light that went off on previous flights, an official said.
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.