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

🇺🇸 N119SY - Embraer EMB-175 LR - United Express SKW5544/OO5544, Nashville (BNA) to Chicago O'Hare (ORD) - 3.5 mi away @ 30475 ft, heading NNE at 516 mph. Spotted 23x before! [04:18:33 PM CDT] #A04F49 #N119SY #E75L #SKYWEST #SKW5544 #OO5544 #autopilot #ADSB #ADSBbot