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

🇺🇸 N603SK - Bombardier CRJ 700 701 - Delta Connection SKW5721/OO5721 (HSV-ORD-ATW) - 4.1 mi away @ 34975 ft, heading NNE at 433 mph. Spotted 18x before. [10:36:04 AM CST] #A7D3FE #N603SK #CRJ7 #SKYWEST #SKW5721 #OO5721 #ADSB #ADSBbot