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

🇺🇸 N304SY - Embraer EMB-175 LL - Delta Connection SKW3787/OO3787 (ATL-XNA-ATL) - 4.4 mi away @ 36975 ft, heading SW at 422 mph. Spotted for first time! [08:48:55 AM CDT] #A32FD5 #N304SY #E75L #SKYWEST #SKW3787 #OO3787 #autopilot #ADSB #ADSBbot