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

🇺🇸 N8919K - Boeing 737MAX 8 - Southwest Airlines SWA2013/WN2013 (STL-PHX-SAN) - 3.5 mi away @ 11575 ft, heading SW at 304 mph. Spotted 53x before. [05:40:56 AM CDT] #AC4CA8 #N8919K #B38M #SOUTHWEST #SWA2013 #WN2013 #TakingOff #ADSB #ADSBbot