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

🇺🇸 N8578Q - Boeing 737NG 800/W - Southwest Airlines SWA6649/WN6649, Chicago Midway (MDW) to Dallas Love Field (DAL) - 4.8 mi away @ 39850 ft, heading SW at 525 mph. Spotted 61x before! [03:00:03 PM CDT] #ABC4D8 #N8578Q #B738 #SOUTHWEST #SWA6649 #WN6649 #ADSB #ADSBbot