Alaska Airlines placed restrictions on the Boeing plane involved in a dramatic mid-air blowout after pressurisation warnings in the days before Friday's incident, investigators say.
The jet had been prevented from making long-haul flights over water, said Jennifer Homendy of the US National Transportation Safety Board (NTSB).
The NTSB also says the missing section of plane has now been found - in the back garden of a Portland teacher.
No-one was hurt in Friday's drama.
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