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

🇺🇸 N8571Z - Boeing 737NG 800/W - Southwest Airlines SWA1946/WN1946, Will Rogers World (OKC) to Chicago Midway (MDW) - 4.6 mi away @ 38350 ft, heading ENE at 528 mph. Spotted 83x before! [07:56:10 AM CDT] #ABC3EC #N8571Z #B738 #SOUTHWEST #SWA1946 #WN1946 #ADSB #ADSBbot