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

🇺🇸 N15710 - Boeing 737NG 724/W - United Airlines UAL8141/UA8141, Newark Liberty (EWR) to Los Angeles (LAX) - 5.9 mi away @ 39225 ft, heading SW at 503 mph. Spotted 28x before! [08:52:43 PM CST] #A0E6C4 #N15710 #B737 #UNITED #UAL8141 #UA8141 #ADSB #ADSBbot