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

🇺🇸 N77573 - Boeing 737MAX 9 - United Airlines UAL1576/UA1576, Newark Liberty (EWR) to Harry Reid (LAS) - 4.2 mi away @ 35900 ft, heading WSW at 534 mph. Spotted 2x before! [04:16:56 PM CDT] #AA7F03 #N77573 #B39M #UNITED #UAL1576 #UA1576 #ADSB #ADSBbot