(Reuters) - The head of the National Transportation Safety Board said Wednesday Boeing has not provided some documents and information sought in its ongoing investigation into the Jan. 5 Alaska Airlines 737 MAX 9 mid-air emergency.

NTSB Chair Jennifer Homendy said investigators have sought the names of the 25 people that work on door plugs at a Boeing ( BA ) facility in Washington but have not received it from Boeing ( BA ). "It is absurd that two months later we don't have it," Homendy said at a Senate hearing.