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

🇺🇸 N14527 - AIRBUS A321neo - UNITED AIRLINES INC UAL789/UA789, Denver (DEN) to Ronald Reagan Washington Ntl (DCA) - 4.2 mi away @ 33875 ft, heading E at 586 mph. Spotted once before. [12:16:17 PM CST] #A0B801 #N14527 #A21N #UAL789 #UA789 #ADSB #ADSBbot