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

🇺🇸 N315NH - Embraer EMB-175 LR - American Eagle ENY3881/MQ3881 (ORD-MEM-ORD) - 4.5 mi away @ 37400 ft, heading SSW at 481 mph. Spotted 11x before! [09:14:00 AM CDT] #A35A98 #N315NH #E75L #ENVOY #ENY3881 #MQ3881 #autopilot #ADSB #ADSBbot