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

🇺🇸 84-0129 - Gates C-21A - United States Air Force SPAR813 - 3.9 mi away @ 30975 ft, heading WNW at 332 mph. Spotted 7x before! [08:23:08 AM CST] #AE0178 #reg_840129 #LJ35 #SPAR813 #military #ADSB #ADSBbot