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

🇺🇸 N328K - Gulfstream Aerospace GVII-G600 - Executive Jet Management EJM328, General Mitchell (MKE) to Austin-Bergstrom (AUS) - 4.7 mi away @ 39975 ft, heading SW at 467 mph. Spotted for first time! [04:04:10 PM CST] #A38CE9 #N328K #GA6C #JET_SPEED #EJM328 #autopilot #ADSB #ADSBbot