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

🇺🇸 N77590 - Boeing 737MAX 9 - United Airlines UAL1298/UA1298, Harry Reid (LAS) to Newark Liberty (EWR) - 4.1 mi away @ 34100 ft, heading ESE at 600 mph. Spotted for first time! [06:50:47 PM CDT] #AA7F46 #N77590 #B39M #UNITED #UAL1298 #UA1298 #ADSB #ADSBbot