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

🇺🇸 N157SY - Embraer EMB-175 LR - United Express SKW5998/OO5998, St Louis Lambert (STL) to San Francisco (SFO) - 3.3 mi away @ 12200 ft, heading WNW at 411 mph. Spotted 31x before! [06:54:30 PM CDT] #A0E5D7 #N157SY #E75L #SKYWEST #SKW5998 #OO5998 #autopilot #Landing #Departure #ADSB #ADSBbot