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

🇺🇸 N8570W - Boeing 737NG 800/W - Southwest Airlines SWA6676/WN6676, William P Hobby (HOU) to Chicago Midway (MDW) - 4.5 mi away @ 38150 ft, heading NNE at 490 mph. Spotted 100x before! [04:48:29 PM CDT] #ABC3C6 #N8570W #B738 #SOUTHWEST #SWA6676 #WN6676 #ADSB #ADSBbot