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

🇺🇸 N491WN - Boeing 737NG 7H4/W - Southwest Airlines SWA4218/WN4218 - 3.4 mi away @ 9000 ft, heading WSW at 312 mph. Spotted 78x before. [06:35:07 PM CST] #A615D0 #N491WN #B737 #SOUTHWEST #SWA4218 #WN4218 #TakingOff #ADSB #ADSBbot