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

🇺🇸 N658UA - Boeing 767 322ER/W - United Airlines UAL3856/UA3856 - 4.6 mi away @ 39875 ft, heading SSW at 572 mph. Spotted for first time! [06:20:12 PM CDT] #A8AC35 #N658UA #B763 #UNITED #UAL3856 #UA3856 #ADSB #ADSBbot