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

🇺🇸 N39423 - Boeing 737NG 924ER/W - United Airlines UAL2608/UA2608 (LAS-IAH-EWR) - 4.4 mi away @ 32575 ft, heading NNE at 542 mph. Spotted 11x before! [06:21:04 PM CDT] #A4945F #N39423 #B739 #UNITED #UAL2608 #UA2608 #ADSB #ADSBbot