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

🇺🇸 N8888M - Boeing 737MAX 8 - Southwest Airlines SWA4127/WN4127, St Louis Lambert (STL) to Denver (DEN) - 3.3 mi away @ 14350 ft, heading NW at 408 mph. Spotted 46x before. [06:57:45 PM CST] #AC3F09 #N8888M #B38M #SOUTHWEST #SWA4127 #WN4127 #TakingOff #Departure #ADSB #ADSBbot