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

🇺🇸 N47345 - Boeing 737MAX 8 - United Airlines UAL457K/UA457K (JAX-ORD-AUS) - 4.7 mi away @ 38350 ft, heading SW at 520 mph. Spotted 5x before! [09:20:58 PM CDT] #A5CF41 #N47345 #B38M #UNITED #UAL457K #UA457K #ADSB #ADSBbot