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

🇺🇸 N8942L - BOEING 737 MAX 8 - SOUTHWEST AIRLINES CO SWA2976/WN2976, St Louis Lambert (STL) to Denver (DEN) - 3.4 mi away @ 17500 ft, heading NW at 399 mph. Spotted 29x before. [05:55:04 PM CDT] #AC56D9 #N8942L #B38M #SWA2976 #WN2976 #Departure #ADSB #ADSBbot