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

🇺🇸 N872UA - Airbus A319 132 - United Airlines UAL1561/UA1561 (SDF-DEN-SFO-PHX) - 4.3 mi away @ 37475 ft, heading W at 452 mph. Spotted 37x before! [07:48:53 AM CST] #ABFF87 #N872UA #A319 #UNITED #UAL1561 #UA1561 #ADSB #ADSBbot