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

🇺🇸 N68821 - Boeing 737NG 924ER/W - United Airlines UAL1273/UA1273, Sacramento (SMF) to Washington Dulles (IAD) - 4.8 mi away @ 34750 ft, heading E at 575 mph. Spotted 10x before! [01:14:15 PM CDT] #A923A7 #N68821 #B739 #UNITED #UAL1273 #UA1273 #ADSB #ADSBbot