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

🇺🇸 N17753 - Boeing 737NG 7V3/W - United Airlines UAL3876/UA3876, George Bush Intcntl/Houston (IAH) to Chicago/Rockford (RFD) - 7.2 mi away @ 38650 ft, heading NNE at 539 mph. Spotted 20x before! [08:32:36 AM CST] #A13651 #N17753 #B737 #UNITED #UAL3876 #UA3876 #ADSB #ADSBbot