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

🇺🇸 N8717M - Boeing 737MAX 8 - Southwest Airlines SWA1905/WN1905 (SAT-MDW-DCA) - 4.7 mi away @ 39075 ft, heading NE at 512 mph. Spotted 54x before! [08:03:44 AM CDT] #ABFD66 #N8717M #B38M #SOUTHWEST #SWA1905 #WN1905 #ADSB #ADSBbot