UPS and FedEx will ground 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 companies announced late Friday.

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The holiday season is in full swing and the post office, UPS and FedEx have set the deadlines to make sure your cards and packages to their destinations in time for the celebrations. The USPS said that Dec. 17 is the key date for Ground Advantage and First-Class mail going to the contiguous U.S.

One of the engines fell off during takeoff of the MD-11, an old workhorse for FedEx and UPS that is in the process of being phased out.