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

🇺🇸 N114NF - Aeronautical Radio XAA2989 - 3.2 mi away @ 11900 ft, heading SW at 399 mph. Spotted once before! [08:41:40 AM CST] #A03C41 #N114NF #ROCKFISH #XAA2989 #autopilot #TakingOff #ADSB #ADSBbot