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.

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FedEx said in an email that it will be grounding th

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