LOUISVILLE, Ky. (AP) — UPS and FedEx will ground their fleets of McDonnell Douglas MD-11 planes “out of an abundance of caution” following a deadly crash at the UPS global aviation hub in Kentucky, the companies announced late Friday.

The MD-11 aircrafts make up about 9% of of the UPS airline fleet and 4% of the FedEx fleet, according to the companies.

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