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

🇺🇸 N7704B - Boeing 737NG 7BD/W - Southwest Airlines SWA3909/WN3909, Will Rogers World (OKC) to Ronald Reagan Washington Ntl (DCA) - 5.0 mi away @ 42600 ft, heading ENE at 501 mph. Spotted 75x before! [12:10:52 PM CDT] #AA6BED #N7704B #B737 #SOUTHWEST #SWA3909 #WN3909 #ADSB #ADSBbot