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 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.

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.