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

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

🇺🇸 N833US - McDonnell Douglas DC-9 88SF - USA Jet Airlines JUS501/UJ501, Del Rio (DRT) to Willow Run (YIP) - 9.7 mi away @ 38500 ft, heading NE at 498 mph. Spotted 13x before! [07:54:18 PM CDT] #AB6552 #N833US #MD88 #JET_USA #JUS501 #UJ501 #ADSB #ADSBbot