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

🇺🇸 N420AN - Airbus A321 253NXSL - American Airlines AAL2828/AA2828 (LAX-DCA-LAX) - 3.5 mi away @ 24400 ft, heading W at 510 mph. Spotted 12x before. [06:12:42 PM CST] #A4FBAC #N420AN #A21N #AMERICAN #AAL2828 #AA2828 #ADSB #ADSBbot