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

🇲🇽 XA-OTC - AMX689/AM689, Chicago O'Hare (ORD) to Licenciado Benito Juarez (MEX) - 4.2 mi away @ 35275 ft, heading SSW at 479 mph. Spotted for first time! [02:14:01 AM CST] #0D121B #XA_OTC #B38M #AMX689 #AM689 #ADSB #ADSBbot