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

🇺🇸 N1808U - Boeing 737MAX 8 - Southwest Airlines SWA3693/WN3693, Baltimore/Washington Thurgood Marshall (BWI) to San Francisco (SFO) - 4.2 mi away @ 34750 ft, heading W at 456 mph. Spotted 63x before. [09:21:19 PM CDT] #A1442F #N1808U #B38M #SOUTHWEST #SWA3693 #WN3693 #ADSB #ADSBbot