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

🇺🇸 N156SY - Embraer EMB-175 LR - United Express SKW5940/OO5940, San Francisco (SFO) to St Louis Lambert (STL) - 3.5 mi away @ 8800 ft, heading E at 305 mph. Spotted 21x before! [04:49:14 PM CDT] #A0E220 #N156SY #E75L #SKYWEST #SKW5940 #OO5940 #autopilot #Landing #Arrival #ADSB #ADSBbot