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

🇺🇸 N77590 - Boeing 737MAX 9 - United Airlines UAL312T/UA312T (DSM-ORD-AUS) - 3.6 mi away @ 29650 ft, heading SW at 440 mph. Spotted 2x before. [08:49:10 PM CST] #AA7F46 #N77590 #B39M #UNITED #UAL312T #UA312T #ADSB #ADSBbot