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

🇺🇸 N904WN - Boeing 737NG 7H4/W - Southwest Airlines SWA3258/WN3258 (DEN-DAL-MDW) - 15.9 mi away @ 37225 ft, heading NNE at 544 mph. Spotted 52x before! [11:17:45 AM CDT] #AC8009 #N904WN #B737 #SOUTHWEST #SWA3258 #WN3258 #ADSB #ADSBbot