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

🇺🇸 N8857Q - Boeing 737MAX 8 - Southwest Airlines SWA4212/WN4212, San Diego (SAN) to Baltimore/Washington Thurgood Marshall (BWI) - 4.1 mi away @ 35400 ft, heading E at 600 mph. Spotted 77x before. [03:31:34 AM CST] #AC33C4 #N8857Q #B38M #SOUTHWEST #SWA4212 #WN4212 #ADSB #ADSBbot