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

🇺🇸 N200NN - Embraer EMB-175 LR - American Eagle ENY3545/MQ3545 (ORD-ATL-ORD) - 4.1 mi away @ 34525 ft, heading NNW at 504 mph. Spotted 23x before! [08:51:17 PM CDT] #A1933C #N200NN #E75L #ENVOY #ENY3545 #MQ3545 #autopilot #ADSB #ADSBbot