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

🇺🇸 N7821L - Boeing 737NG 7CT/W - Southwest Airlines SWA2542/WN2542 (RDU-ATL-MCI-MDW-CLT-DAL-TUS) - 4.8 mi away @ 35950 ft, heading WNW at 516 mph. Spotted 64x before! [10:39:55 AM CDT] #AA9A7A #N7821L #B737 #SOUTHWEST #SWA2542 #WN2542 #ADSB #ADSBbot