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

🇺🇸 N842US - McDonnell Douglas DC-9 88SF - USA Jet Airlines JUS403/UJ403, Gary/Chicago (GYY) to Laredo (LRD) - 4.3 mi away @ 35075 ft, heading SW at 564 mph. Spotted 14x before. [02:27:29 AM CST] #AB891A #N842US #MD88 #JET_USA #JUS403 #UJ403 #ADSB #ADSBbot