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

🇺🇸 N8509U - Boeing 737NG 800/W - Southwest Airlines SWA1743/WN1743, Southwest Florida (RSW) to Kansas City (MCI) - 4.7 mi away @ 37425 ft, heading WNW at 492 mph. Spotted 73x before! [02:24:19 PM CDT] #ABAAFE #N8509U #B738 #SOUTHWEST #SWA1743 #WN1743 #ADSB #ADSBbot