Europe’s Airbus has finalized an agreement to take some assets from Spirit AeroSystems, both companies said Monday, completing a critical part of a transatlantic carve-up of the struggling supplier with US rival Boeing.

Airbus agreed to acquire some Spirit AeroSystems facilities that make parts for its jets, moving to take direct control of production in a bid to stabilize supply chains after months of disruption.The companies said Monday that they had entered into a definitive deal for Airbus to take over several of Spirit’s plants in the U.