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

🇺🇸 N8940Q - BOEING 737-8 - Southwest Airlines SWA4474/WN4474, St Louis Lambert (STL) to Harry Reid (LAS) - 3.3 mi away @ 14675 ft, heading WNW at 406 mph. Spotted 25x before. [09:42:57 PM CDT] #AC5697 #N8940Q #B38M #SOUTHWEST #SWA4474 #WN4474 #TakingOff #Departure #ADSB #ADSBbot