Preliminary findings from an independent investigation show that a handful of key bolts appear to be missing from the door plug that blew out of a Boeing 737 Max 9 plane midflight in early January. New photos released Tuesday appear to show four key bolts were missing from the door panel that flew off during an Alaska Air flight Jan. 5, citing a preliminary report from the U.S. National Transportation Safety Board (NTSB). . #alaskaairlines #boeing737