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

🇺🇸 N37351 - Boeing 737MAX 8 - United Airlines UAL2237/UA2237, George Bush Intcntl/Houston (IAH) to Washington Dulles (IAD) - 4.4 mi away @ 36825 ft, heading NE at 503 mph. Spotted 4x before! [08:05:32 PM CDT] #A44211 #N37351 #B38M #UNITED #UAL2237 #UA2237 #ADSB #ADSBbot