At GE Aircraft in Nantgarw, there were recently 900 applications for 25 places.
BBC: An electrician and his apprentice
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The aero engine company GE also shed hundreds of jobs at its plant at Nantgarw near Cardiff last October.
BBC: Jobs go as aerospace plant closes
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GE's aero-engine facility at Nantgarw has axed hundreds of jobs while more than 100 posts are going at the Trefn aviation components - an Airbus supplier - at Llay near Wrexham.