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

🇺🇸 N27519 - Boeing 737MAX 9 - United Airlines UAL1110/UA1110 (DEN-PHX-IAD) - 4.7 mi away @ 37700 ft, heading E at 618 mph. Spotted 10x before! [06:43:45 PM CDT] #A2BBAC #N27519 #B39M #UNITED #UAL1110 #UA1110 #ADSB #ADSBbot