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

🇺🇸 N557UW - Airbus A321 231 - American Airlines AAL863/AA863, Denver (DEN) to Charlotte/Douglas (CLT) - 4.5 mi away @ 37750 ft, heading ESE at 596 mph. Spotted 5x before! [11:06:38 AM CST] #A71B43 #N557UW #A321 #AMERICAN #AAL863 #AA863 #ADSB #ADSBbot