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

🇺🇸 N16732 - Boeing 737NG 724/W - United Airlines UAL2224/UA2224, George Bush Intcntl/Houston (IAH) to Ronald Reagan Washington Ntl (DCA) - 6.7 mi away @ 38825 ft, heading NE at 593 mph. Spotted 20x before! [10:32:21 PM CDT] #A10E8B #N16732 #B737 #UNITED #UAL2224 #UA2224 #ADSB #ADSBbot