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

🇺🇸 N57439 - Boeing 737NG 924ER/W - United Airlines UAL1669/UA1669, Washington Dulles (IAD) to Denver (DEN) - 5.3 mi away @ 31775 ft, heading W at 523 mph. Spotted 14x before! [03:39:13 PM CDT] #A76028 #N57439 #B739 #UNITED #UAL1669 #UA1669 #ADSB #ADSBbot