Bolts that should have kept Alaska Airlines flight’s door plug in place are missing

Four bolts should have kept the left door plug secure to prevent it from moving upwards and disengaging from the Boeing 737 Max 9, National Transportation Safety Board Chair Jennifer Homendy said during a Monday night press conference.

Those four bolts were also missing when the NTSB recovered the door plug, making it unclear if they were ever there to begin with.