UPS and FedEx said they are grounding 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 crash Tuesday at UPS Worldport in Louisville killed 14 people, including the three pilots on the MD-11 that was headed for Honolulu.

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

“We made this decision proactively at the recommendation of the aircraft manufacturer,” a UPS statement said late Friday. “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

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