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

🇺🇸 N17719 - Boeing 737NG 724/W - United Airlines UAL8181/UA8181 (LAX-SFO-SEA-IAD) - 5.1 mi away @ 40050 ft, heading SW at 545 mph. Spotted 19x before! [11:31:45 AM CDT] #A135CB #N17719 #B737 #UNITED #UAL8181 #UA8181 #ADSB #ADSBbot