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

🇺🇸 N37281 - Boeing 737NG 824/W - United Airlines UAL368/UA368, Denver (DEN) to Nashville (BNA) - 4.7 mi away @ 38075 ft, heading ESE at 563 mph. Spotted once before! [12:43:42 PM CDT] #A43EC3 #N37281 #B738 #UNITED #UAL368 #UA368 #ADSB #ADSBbot