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

🇺🇸 N404WN - Boeing 737NG 7H4/W - Southwest Airlines SWA403/WN403 - 3.5 mi away @ 9725 ft, heading SW at 310 mph. Spotted 50x before! [02:48:03 PM CST] #A4BD7E #N404WN #B737 #SOUTHWEST #SWA403 #WN403 #TakingOff #ADSB #ADSBbot