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

🇺🇸 N8309C - Boeing 737NG 8H4/W - Southwest Airlines SWA3712/WN3712, Chicago Midway (MDW) to Phoenix Sky Harbor (PHX) - 5.1 mi away @ 37750 ft, heading WSW at 479 mph. Spotted 81x before! [03:19:31 PM CDT] #AB5BF0 #N8309C #B738 #SOUTHWEST #SWA3712 #WN3712 #ADSB #ADSBbot