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

🇺🇸 N342FR - Airbus A320 251NSL - Frontier Airlines FFT9842/F99842 - 3.4 mi away @ 11575 ft, heading WSW at 359 mph. Spotted 26x before! [07:34:59 PM CDT] #A3C549 #N342FR #A20N #FRONTIER_FLIGHT #FFT9842 #F99842 #TakingOff #ADSB #ADSBbot