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

🇺🇸 N1804U - Boeing 737MAX 8 - Southwest Airlines SWA2068/WN2068, Baltimore/Washington Thurgood Marshall (BWI) to Denver (DEN) - 4.9 mi away @ 40325 ft, heading W at 539 mph. Spotted 46x before! [10:36:23 PM CDT] #A143A3 #N1804U #B38M #SOUTHWEST #SWA2068 #WN2068 #ADSB #ADSBbot