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

🇺🇸 N831US - McDonnell Douglas DC-9 83SF - USA Jet Airlines JUS501/UJ501, Willow Run (YIP) to Laredo (LRD) - 4.1 mi away @ 35450 ft, heading SSW at 504 mph. Spotted 12x before. [08:46:04 PM CST] #AB5DE4 #N831US #MD83 #JET_USA #JUS501 #UJ501 #ADSB #ADSBbot