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

🇺🇸 N901WN - Boeing 737NG 7H4/W - Southwest Airlines SWA4138/WN4138 (STL-DEN-SMF) - 3.5 mi away @ 16025 ft, heading WNW at 381 mph. Spotted 80x before! [03:04:17 PM CDT] #AC74E4 #N901WN #B737 #SOUTHWEST #SWA4138 #WN4138 #ADSB #ADSBbot