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

🇺🇸 N37504 - Boeing 737MAX 9 - United Airlines UAL1664/UA1664, Punta Cana (PUJ) to Chicago O'Hare (ORD) - 4.2 mi away @ 32300 ft, heading NNW at 477 mph. Spotted 2x before! [05:44:46 PM CDT] #A448D3 #N37504 #B39M #UNITED #UAL1664 #UA1664 #ADSB #ADSBbot