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

🇺🇸 N27724 - Boeing 737NG 724/W - United Airlines UAL704/UA704 (DEN-ABQ-IAD) - 4.8 mi away @ 39750 ft, heading E at 603 mph. Spotted 31x before! [06:17:29 PM CST] #A2C338 #N27724 #B737 #UNITED #UAL704 #UA704 #ADSB #ADSBbot