The head of the U.S. National Transportation Safety Board (NTSB) said on Wednesday investigators still do not know who worked on a Boeing 737 MAX 9 door plug involved in an Alaska Airlines mid-air emergency and that video footage was overwritten.
NTSB Chair Jennifer Homendy said in a letter to senators that investigators sought security camera footage when the door plug was opened and closed in September but were informed the material was overwritten.
“The absence of those records will complicate the NTSB’s investigation moving forward,” Homendy said.
The NTSB said previously that four key bolts were missing from the door plug that blew out on the plane.
Alaska Airlines Flight 1282 had 171 passengers and six crew on board and was
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