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

🇺🇸 N8809L - Boeing 737MAX 8 - Southwest Airlines SWA2728/WN2728, Phoenix Sky Harbor (PHX) to Baltimore/Washington Thurgood Marshall (BWI) - 4.6 mi away @ 36750 ft, heading ENE at 584 mph. Spotted 72x before! [06:30:43 PM CDT] #AC2173 #N8809L #B38M #SOUTHWEST #SWA2728 #WN2728 #ADSB #ADSBbot