Clarification for anyone who is as confused as I was: Spirit Aerosystems, not Spirit Airlines. Spirit Aerosystems is the subcontractor that made the door plug.

Clarification for anyone who is as confused as I was: Spirit Aerosystems, not Spirit Airlines. Spirit Aerosystems is the subcontractor that made the door plug. It was spun out of Boeing in 2005 and still has tight employee connections. Spirit Airlines has no connection to Boeing; they actually run an all-Airbus fleet.