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

🇺🇸 N8576Z - Boeing 737NG 800/W - Southwest Airlines SWA1420/WN1420 (BWI-COS) - 4.0 mi away @ 35450 ft, heading W at 445 mph. Spotted 65x before! [05:47:10 PM CDT] #ABC49B #N8576Z #B738 #SOUTHWEST #SWA1420 #WN1420 #ADSB #ADSBbot