Map of the St. Louis area showing the position and track of the aircraft described in the post.

🇱🇺 LX-NCL - Boeing 747 4EVERF - Cargolux Airlines International CLX73J/CV73J (LUX-DFW-IAH) - 4.7 mi away @ 38950 ft, heading SW at 531 mph. Spotted once before! [04:08:40 PM CDT] #4D0131 #LX_NCL #B744 #CARGOLUX #CLX73J #CV73J #ADSB #ADSBbot