🇺🇸 N721FR - Airbus A321 211SL - Frontier Airlines FFT1783/F91783, Nashville (BNA) to Denver (DEN) - 4.3 mi away @ 36100 ft, heading WNW at 516 mph. Spotted 60x before. [04:06:45 PM CDT] #A9A7D0 #N721FR #A321 #FRONTIER_FLIGHT #FFT1783 #F91783 #ADSB #ADSBbot