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

🇺🇸 N549CA - Bombardier CRJ 900 LR NG - Delta Connection SKW3978/OO3978 (MSP-SDF-MSP) - 5.0 mi away @ 38000 ft, heading W at 518 mph. Spotted once before! [02:56:23 PM CDT] #A6F98E #N549CA #CRJ9 #SKYWEST #SKW3978 #OO3978 #ADSB #ADSBbot