LOUISVILLE, Ky. (AP) — UPS will ground its fleet of MD-11 planes out of an abundance of caution following a deadly crash at its global aviation hub in Kentucky, the company announced late Friday. The MD-11 aircrafts make up about 9% of its airline fleet, according to the company. The decision was made proactively at the recommendation of the aircraft manufacturer. The crash at UPS Worldport in Louisville resulted in 14 fatalities, including three pilots. Reports indicate that the aircraft was nearly airborne when an alarm rang in the cockpit, and immediate investigation is underway.