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 finalised an agreement on Monday to take over some plants from Spirit AeroSystems in a carve-up of the struggling supplier with rival Boeing , as unions voiced fears over thousands of jobs in Northern Ireland and Scotland.

Airbus has finalised a deal to take over part of the Spirit AeroSystems operation in Belfast. The deal was first announced in July last year as part of a wider break up of the Spirit business. The transaction also includes Airbus work packages at the Spirit factory at Prestwick in Scotland.