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

🇺🇸 N8906K - Boeing 737MAX 8 - Southwest Airlines SWA4555/WN4555, St Louis Lambert (STL) to San Francisco (SFO) - 3.4 mi away @ 14025 ft, heading NW at 388 mph. Spotted 44x before. [08:51:54 AM CDT] #AC4888 #N8906K #B38M #SOUTHWEST #SWA4555 #WN4555 #TakingOff #Departure #ADSB #ADSBbot