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

🇺🇸 N8940Q - BOEING 737-8 - Southwest Airlines SWA2133/WN2133, Austin-Bergstrom (AUS) to Chicago Midway (MDW) - 4.4 mi away @ 37850 ft, heading NNE at 545 mph. Spotted 18x before! [01:12:02 PM CST] #AC5697 #N8940Q #B38M #SOUTHWEST #SWA2133 #WN2133 #ADSB #ADSBbot