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

🇺🇸 N1807U - Boeing 737MAX 8 - Southwest Airlines SWA1614/WN1614 (LAX-BWI-JAX) - 4.0 mi away @ 36350 ft, heading ENE at 632 mph. Spotted 40x before! [12:21:20 PM CDT] #A1440C #N1807U #B38M #SOUTHWEST #SWA1614 #WN1614 #ADSB #ADSBbot