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

🇺🇸 N38727 - Boeing 737NG 724/W - United Airlines UAL673T/UA673T (PIT-ORD-DFW) - 4.6 mi away @ 39850 ft, heading SW at 473 mph. Spotted 15x before! [08:55:12 PM CDT] #A47809 #N38727 #B737 #UNITED #UAL673T #UA673T #ADSB #ADSBbot