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

🇺🇸 N8873S - Boeing 737MAX 8 - Southwest Airlines SWA497/WN497, Denver (DEN) to Chicago Midway (MDW) - 5.1 mi away @ 41500 ft, heading ENE at 623 mph. Spotted 77x before! [09:59:43 PM CST] #AC3AA8 #N8873S #B38M #SOUTHWEST #SWA497 #WN497 #ADSB #ADSBbot