The MD11 usually comes from Philly (Sometimes Louisville non-stop) then after Cologne goes on to Hong Kong (non-stop), then turns around to Dubai via Bombay before returning back to Cologne and eventually back to Philly and Louisville or direct to Louisville.
I tracked some flights going to Cologne/Bonn today and it appeared they were coming from Philadelphia, and Louisville. If I recall though, one of them was a 767, sorry, I can't remember exactly what it was.
There are two MD-11s every night. One leaves Monday night until thursday night for CRK via HKG and returns via HKG, BOM and DXB. On Friday night it leaves for DXB, then HKG and returns on Sunday daytime.
The other one flies from CGN to SDF via PHL.