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

🇺🇸 N8321D - Boeing 737NG 8H4/W - Southwest Airlines SWA1120/WN1120, Harry Reid (LAS) to Indianapolis (IND) - 4.4 mi away @ 36700 ft, heading E at 570 mph. Spotted 85x before! [02:51:39 PM CDT] #AB6247 #N8321D #B738 #SOUTHWEST #SWA1120 #WN1120 #ADSB #ADSBbot