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

🇺🇸 N225WN - Boeing 737NG 7H4/W - Southwest Airlines SWA3506/WN3506 (DEN-MCI-BWI-CLE) - 4.5 mi away @ 40725 ft, heading E at 637 mph. Spotted 49x before! [10:36:27 AM CST] #A1F595 #N225WN #B737 #SOUTHWEST #SWA3506 #WN3506 #ADSB #ADSBbot