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

🇺🇸 N17550 - Boeing 737MAX 9 - United Airlines UAL2325/UA2325, Washington Dulles (IAD) to Denver (DEN) - 4.4 mi away @ 35975 ft, heading WSW at 488 mph. Spotted 4x before! [10:52:23 PM CDT] #A12EE0 #N17550 #B39M #UNITED #UAL2325 #UA2325 #ADSB #ADSBbot