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

🇺🇸 N380FR - Airbus A320 251NSL - Frontier Airlines FFT687/F9687, Ronald Reagan Washington Ntl (DCA) to Denver (DEN) - 4.9 mi away @ 38300 ft, heading W at 507 mph. Spotted 17x before! [01:39:22 PM CDT] #A45BD7 #N380FR #A20N #FRONTIER_FLIGHT #FFT687 #F9687 #ADSB #ADSBbot