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

🇺🇸 N209WN - Boeing 737NG 7H4/W - Southwest Airlines SWA3948/WN3948, Minneapolis-St Paul/Wold-Chamberlain (MSP) to Chicago Midway (MDW) - 4.0 mi away @ 33850 ft, heading WSW at 439 mph. Spotted 70x before! [07:53:24 PM CST] #A1B573 #N209WN #B737 #SOUTHWEST #SWA3948 #WN3948 #ADSB #ADSBbot