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

🇺🇸 N68843 - Boeing 737NG 924ER/W - United Airlines UAL2217/UA2217 (IAD-IAH-LAX) - 4.2 mi away @ 33525 ft, heading SW at 503 mph. Spotted 7x before! [07:33:21 PM CDT] #A923EF #N68843 #B739 #UNITED #UAL2217 #UA2217 #ADSB #ADSBbot