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

🇺🇸 N959WN - Boeing 737NG 7H4/W - Southwest Airlines SWA1667/WN1667, Baltimore/Washington Thurgood Marshall (BWI) to Denver (DEN) - 4.8 mi away @ 40900 ft, heading W at 418 mph. Spotted 66x before! [10:03:21 PM CDT] #AD5817 #N959WN #B737 #SOUTHWEST #SWA1667 #WN1667 #ADSB #ADSBbot