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

🇺🇸 N238NN - Embraer EMB-175 LR - American Eagle ENY4146/MQ4146 (ORD-MYR-ORD) - 3.5 mi away @ 30950 ft, heading NNE at 536 mph. Spotted 27x before! [06:03:24 PM CDT] #A22771 #N238NN #E75L #ENVOY #ENY4146 #MQ4146 #autopilot #ADSB #ADSBbot