UPS has temporarily grounded part of its air fleet after a deadly crash involving one of its cargo planes killed at least 14 people in Kentucky .

The decision will affect around 9 percent of the company's aircraft.

"Out of an abundance of caution and in the interest of safety, we have made the decision to temporarily ground our MD-11 fleet. MD-11s are approximately 9% of the UPS Airlines fleet," said the company in a statement.

"The grounding is effective immediately. We made this decision proactively at the recommendation of the aircraft manufacturer. Nothing is more important to us than the safety of our employees and the communities we serve," added the statement.

"Contingency plans are in place to ensure we can continue to deliver the reliable service our customers around the w

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