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

🇺🇸 N44522 - Airbus A321 271NXSL - United Airlines UAL1715/UA1715, Denver (DEN) to Newark Liberty (EWR) - 4.3 mi away @ 36500 ft, heading E at 571 mph. Spotted 3x before! [10:19:40 PM CDT] #A55FE9 #N44522 #A21N #UNITED #UAL1715 #UA1715 #ADSB #ADSBbot