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 SWA4116/WN4116 (BWI-LGB-SLC) - 4.6 mi away @ 37775 ft, heading W at 515 mph. Spotted 74x before! [04:07:39 PM CDT] #AA6BED #N7704B #B737 #SOUTHWEST #SWA4116 #WN4116 #ADSB #ADSBbot