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

🇺🇸 N14512 - Airbus A321 271NXSL - United Airlines UAL8101/UA8101 (MSY-IAD-LAX-ORD) - 4.4 mi away @ 33050 ft, heading SW at 445 mph. Spotted once before! [09:56:02 PM CDT] #A0B7D9 #N14512 #A21N #UNITED #UAL8101 #UA8101 #ADSB #ADSBbot