LOUISVILLE, Ky. – 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.

“We made this decision proactively at the recommendation of the aircraft manufacturer,” a UPS statement said. “Nothing is more important to us than the safety of our employees and the communities we serve.”

FedEx said in an email that it will be grounding the aircrafts while it conducts “a thorough safety review based on the recommendation of the manufacturer.”

Boeing, which merged with McDonnell Douglas in 1997, did not immediately respon

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