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

🇺🇸 N8871Q - Boeing 737MAX 8 - Southwest Airlines SWA4738/WN4738 (MDW-BUF-PHX) - 4.7 mi away @ 40400 ft, heading WSW at 455 mph. Spotted 56x before! [08:01:31 PM CDT] #AC3A60 #N8871Q #B38M #SOUTHWEST #SWA4738 #WN4738 #ADSB #ADSBbot