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

🇺🇸 N37508 - Boeing 737MAX 9 - United Airlines UAL2351/UA2351, San Francisco (SFO) to Washington Dulles (IAD) - 4.6 mi away @ 38550 ft, heading E at 606 mph. Spotted 7x before! [03:02:17 AM CDT] #A448D7 #N37508 #B39M #UNITED #UAL2351 #UA2351 #ADSB #ADSBbot