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

🇺🇸 84-0079 - Gates C-21A - United States Air Force SPAR988 - 5.2 mi away @ 31125 ft, heading WNW at 354 mph. Spotted 5x before! [01:17:59 PM CST] #AE0171 #reg_840079 #LJ35 #SPAR988 #military #ADSB #ADSBbot