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

🇺🇸 N8510E - Boeing 737NG 800/W - Southwest Airlines SWA1587/WN1587, Phoenix Sky Harbor (PHX) to Chicago Midway (MDW) - 4.6 mi away @ 36700 ft, heading ENE at 567 mph. Spotted 69x before! [12:33:37 PM CDT] #ABAD6C #N8510E #B738 #SOUTHWEST #SWA1587 #WN1587 #ADSB #ADSBbot