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

🇺🇸 N144AN - Airbus A321 231SL - American Airlines AAL2878/AA2878, Denver (DEN) to Charlotte/Douglas (CLT) - 4.1 mi away @ 35000 ft, heading ESE at 561 mph. Spotted 9x before! [02:24:15 AM CDT] #A0B199 #N144AN #A321 #AMERICAN #AAL2878 #AA2878 #ADSB #ADSBbot