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

🇺🇸 N8724J - Boeing 737MAX 8 - Southwest Airlines SWA1806/WN1806, San Diego (SAN) to Baltimore/Washington Thurgood Marshall (BWI) - 20.3 mi away @ 37625 ft, heading E at 560 mph. Spotted 57x before. [05:45:18 PM CST] #AC00B1 #N8724J #B38M #SOUTHWEST #SWA1806 #WN1806 #ADSB #ADSBbot