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

🇺🇸 N200SY - Embraer EMB-175 LR - United Express SKW5572/OO5572, Chicago O'Hare (ORD) to Tucson (TUS) - 4.1 mi away @ 34800 ft, heading SW at 456 mph. Spotted 45x before. [09:04:23 PM CDT] #A193AA #N200SY #E75L #SKYWEST #SKW5572 #OO5572 #autopilot #ADSB #ADSBbot