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

🇺🇸 N312BT - Embraer EMB-175 LR - American Eagle ENY9872/MQ9872, Chicago O'Hare (ORD) to Dallas-Fort Worth (DFW) - 4.5 mi away @ 37800 ft, heading SW at 494 mph. Spotted 30x before! [12:39:37 PM CDT] #A34E6A #N312BT #E75L #ENVOY #ENY9872 #MQ9872 #autopilot #ADSB #ADSBbot