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

🇺🇸 N50PC - Dassault Falcon 50EX - Chicago Jet Group WDY50 (GYY-NAS) - 4.7 mi away @ 40375 ft, heading SW at 409 mph. Spotted for first time! [06:14:52 PM CST] #A638DF #N50PC #FA50 #WINDY_CITY #WDY50 #ADSB #ADSBbot