UPS Flight 2976 crashed near Louisville Muhammad Ali International Airport, killing all three pilots and 11 people on the ground due to the left engine detaching from the wing during takeoff.The National Transportation Safety Board (NTSB) revealed that metal fatigue and overstress failure caused the engine mount to fail, leading to debris scattering over half a mile and multiple buildings being damaged or destroyed by fire.Following the crash, the FAA grounded all MD-11 aircraft operated by UPS, FedEx, and Western Global as investigations continue, with UPS cooperating fully and relying on other aircraft during the holiday season.