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

🇺🇸 N1809U - Boeing 737MAX 8 - Southwest Airlines SWA3471/WN3471 (LAS-MDW-MSY) - 4.8 mi away @ 41150 ft, heading SW at 509 mph. Spotted 48x before! [08:53:44 PM CDT] #A14452 #N1809U #B38M #SOUTHWEST #SWA3471 #WN3471 #ADSB #ADSBbot