The FAA says it wants to know how unapproved parts found their way onto some aircraft operated by Southwest Airlines, and the company grounded about 10% of its fleet on Saturday "out of an abundance of caution" while negotiating with federal safety officials. The FAA acknowledged that the parts in question don't pose an "immediate safety issue," and a Southwest spokeswoman said the whole matter was a misunderstanding related to a vendor's documentation of parts used during repairs. Southwest can continue flying the planes for 10 days until a more permanent solution is reached, according to the FAA. "We are all working toward that resolution now, but there are no conclusions or mandates at this point," the airline notes.

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