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

🇺🇸 N37547 - Boeing 737MAX 9 - United Airlines UAL1129/UA1129 (IAH-PHX-ORD) - 3.5 mi away @ 4225 ft, heading NNW at 267 mph. Spotted 8x before! [07:41:20 PM CDT] #A44962 #N37547 #B39M #UNITED #UAL1129 #UA1129 #Landing #ADSB #ADSBbot