UPS plane crash explosion Kentucky MD11.

UPS and FedEx has decided to ground their fleets of MD-11 planes “out of an abundance of caution” after a deadly crash at a UPS global aviation hub in Kentucky. The companies announced their decisions separately late Friday. The MD-11 aircraft make up about 9% of the UPS airline fleet and 4% of the FedEx fleet. The companies stated that their decisions were made proactively at the recommendation of the aircraft manufacturer. The crash occurred Tuesday at UPS Worldport in Louisville, Kentucky, killing 14 people, including the three pilots on the MD-11 that was headed for Honolulu.