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

🇺🇸 N563WN - Boeing 737NG 752/W - Southwest Airlines SWA1575/WN1575, William P Hobby (HOU) to Chicago Midway (MDW) - 4.5 mi away @ 39925 ft, heading NNE at 528 mph. Spotted 68x before. [11:42:35 PM CDT] #A73410 #N563WN #B737 #SOUTHWEST #SWA1575 #WN1575 #ADSB #ADSBbot