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

🇺🇸 N723FR - Airbus A321 211SL - Frontier Airlines FFT2800/F92800, Austin-Bergstrom (AUS) to Chicago O'Hare (ORD) - 4.0 mi away @ 30575 ft, heading N at 325 mph. Spotted 59x before! [04:24:46 PM CST] #A9AF3E #N723FR #A321 #FRONTIER_FLIGHT #FFT2800 #F92800 #ADSB #ADSBbot

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

🇺🇸 N351FR - Airbus A320 251NSL - Frontier Airlines FFT2800/F92800, Austin-Bergstrom (AUS) to Chicago O'Hare (ORD) - 4.5 mi away @ 37350 ft, heading NNE at 551 mph. Spotted 36x before! [09:13:26 PM CDT] #A3E911 #N351FR #A20N #FRONTIER_FLIGHT #FFT2800 #F92800 #ADSB #ADSBbot