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

🇺🇸 N391FR - Airbus A320 251NSL - Frontier Airlines FFT3725/F93725, Cincinnati/Northern Kentucky (CVG) to Denver (DEN) - 4.8 mi away @ 40425 ft, heading W at 518 mph. Spotted 21x before! [07:02:14 AM CDT] #A4870D #N391FR #A20N #FRONTIER_FLIGHT #FFT3725 #F93725 #ADSB #ADSBbot