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

🇺🇸 N476UA - Airbus A320 232 - United Airlines UAL3906/UA3906, Zurich (ZRH) to Washington Dulles (IAD) - 4.9 mi away @ 40325 ft, heading NNE at 543 mph. Spotted 30x before! [04:09:44 PM CDT] #A5D927 #N476UA #A320 #UNITED #UAL3906 #UA3906 #ADSB #ADSBbot