The UPS cargo plane that crashed in Louisville on Nov. 4 recently spent six weeks at a San Antonio facility, likely for significant maintenance work.

Nine people were killed and 11 injured after a UPS MD-11 freighter crashed and exploded shortly after takeoff from Louisville. The NTSB and FAA are investigating, with early focus on a possible engine separation.

The NTSB confirmed a UPS cargo plane's left engine separated during takeoff before a fatal Louisville airport crash that killed 12 people and injured 11 others Tuesday.

A UPS MD-11 plane crashed shortly after take-off near the Louisville, Kentucky, airport, according to preliminary information, a source says.

Video of the deadly Louisville, Kentucky, crash showed flames on one of the plane's wings and a huge fireball erupting as the aircraft hit the ground.