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.

Airbus will take over some parts of Spirit AeroSystems as Spirit is reacquired by Boeing. “Spirit has entered into a definitive agreement with Airbus SE to transfer ownership of certain assets and sites involved in the production of Airbus aerostructures to Airbus,” a news release from Spirit said.