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Recycled Carbon Fiber Tested on Boeing MAX 9 Sidewalls
(aviationweek.com)
This is a most excellent place for technology news and articles.
It looks like this material is being used for interior cosmetic components, not load/stress bearing structures:
So things like the interior plastic "wall" you can touch when you're sitting in the window seat. It sounds like a good use for this material if it is otherwise scrap, and has better characteristics than the virgin materials they're using today for these parts.