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

🇺🇸 N715FR - Airbus A321 211SL - Frontier Airlines FFT1415/F91415, Tampa (TPA) to Chicago O'Hare (ORD) - 3.5 mi away @ 29100 ft, heading NNE at 449 mph. Spotted 36x before! [03:12:11 PM CDT] #A98F2D #N715FR #A321 #FRONTIER_FLIGHT #FFT1415 #F91415 #ADSB #ADSBbot