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

🇺🇸 N14518 - Airbus A321 271NXSL - United Airlines UAL2408/UA2408, Denver (DEN) to Washington Dulles (IAD) - 4.3 mi away @ 33175 ft, heading E at 560 mph. Spotted 3x before! [08:08:18 PM CDT] #A0B7DF #N14518 #A21N #UNITED #UAL2408 #UA2408 #ADSB #ADSBbot