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

🇺🇸 N66841 - Boeing 737NG 924ER/W - United Airlines UAL2398/UA2398, Phoenix Sky Harbor (PHX) to Washington Dulles (IAD) - 4.4 mi away @ 35250 ft, heading E at 561 mph. Spotted 5x before! [01:26:50 PM CDT] #A8D4EF #N66841 #B739 #UNITED #UAL2398 #UA2398 #ADSB #ADSBbot