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

🇺🇸 N8573Z - Boeing 737NG 800/W - Southwest Airlines SWA874/WN874, Chicago Midway (MDW) to William P Hobby (HOU) - 4.5 mi away @ 36500 ft, heading SW at 362 mph. Spotted 89x before! [12:30:46 AM CST] #ABC432 #N8573Z #B738 #SOUTHWEST #SWA874 #WN874 #ADSB #ADSBbot