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

🇺🇸 N451CS - Gulfstream Aerospace G650 ER - Jet Aviation Flight Services N451CS - 5.7 mi away @ 44575 ft, heading WSW at 551 mph. Spotted for first time! [08:51:31 AM CDT] #A57616 #N451CS #GLF6 #JET_SETTER #N451CS #autopilot #ADSB #ADSBbot