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

🇺🇸 N708FR - Airbus A321 211SL - Frontier Airlines FFT1483/F91483, Chicago O'Hare (ORD) to Denver (DEN) - 4.3 mi away @ 38025 ft, heading WSW at 527 mph. Spotted 41x before! [06:35:56 AM CDT] #A972D3 #N708FR #A321 #FRONTIER_FLIGHT #FFT1483 #F91483 #ADSB #ADSBbot