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

🇺🇸 N778UA - Boeing 777 222 - United Airlines UAL1423/UA1423, Cancun (CUN) to Chicago O'Hare (ORD) - 4.1 mi away @ 35525 ft, heading N at 562 mph. Spotted 4x before! [05:04:53 PM CST] #AA8882 #N778UA #B772 #UNITED #UAL1423 #UA1423 #ADSB #ADSBbot