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

🇺🇸 N945WN - Boeing 737NG 7H4/W - Southwest Airlines SWA2877/WN2877 (DEN-MCI-DCA) - 4.9 mi away @ 40425 ft, heading E at 555 mph. Spotted 69x before! [08:23:35 PM CDT] #AD21BC #N945WN #B737 #SOUTHWEST #SWA2877 #WN2877 #ADSB #ADSBbot