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

🇺🇸 N138SY - Embraer EMB-175 LR - United Express SKW5958/OO5958, Chicago O'Hare (ORD) to Tulsa (TUL) - 4.4 mi away @ 35700 ft, heading WSW at 457 mph. Spotted 26x before! [10:47:55 PM CST] #A09A90 #N138SY #E75L #SKYWEST #SKW5958 #OO5958 #autopilot #ADSB #ADSBbot