UPS and FedEx announced late Friday that they were grounding their fleets of McDonnell Douglas MD-11 planes following the deadly crash in Kentucky this week.

Here’s what to know about the planes:

MD-11 planes grounded

What they're saying:

The carriers announced their decisions separately but said it was "out of an abundance of caution."

"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 manufacturer.

Boeing, which merged with McDonnell Douglas in 1997, said in a statement o

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