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 on Tuesday at UPS Worldport in Louisville killed 14 people, including the three pilots on the MD-11 that was headed for Honolulu. National Transportation Safety Board official Todd Inman said Thursday that the crashed plane was a 1991 McDonnell Douglas 2 that had been "altered" into a McDonnell Douglas MD-11 Freighter.

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

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