Comment by hansthehorse

It should be remembered that Spirit makes the 737 bare bones fuselage then ships it by train to Boeing. This fuselage had the door plug installed on models that have one. When the fuselage gets to Boing the door plug is removed so the interior team can finish out the component then Boeing (not Spirit) does the final door plug installation. If it turns out the door plug were improperly installed this is going to all on Boeing.