European plane maker Airbus will take over parts of Spirit AeroSystems as it and Boeing carve up the key supplier in an effort to improve production quality.

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.

Europe’s Airbus has reached a deal to acquire manufacturing assets from Spirit AeroSystems as the struggling Kansas-based supplier nears its $4.7 billion reacquisition by Boeing.