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

🇺🇸 N123NN - Airbus A321 231SL - American Airlines AAL2615/AA2615, Philadelphia (PHL) to Salt Lake City (SLC) - 4.8 mi away @ 34850 ft, heading W at 470 mph. Spotted 16x before. [08:09:22 PM CDT] #A06010 #N123NN #A321 #AMERICAN #AAL2615 #AA2615 #ADSB #ADSBbot