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

🇺🇸 N979RP - Embraer EMB-170 SE - United Express RPA4372/YX4372 (ORD-XNA-ORD) - 3.7 mi away @ 31900 ft, heading SW at 573 mph. Spotted 2x before! [08:59:02 AM CDT] #ADA699 #N979RP #E170 #BRICKYARD #RPA4372 #YX4372 #autopilot #ADSB #ADSBbot