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

🇨🇦 C-FWSX - Boeing 737NG 7CT/W - WestJet WJA1421/WS1421, Nashville (BNA) to Edmonton (YEG) - 4.7 mi away @ 39900 ft, heading NW at 563 mph. Spotted once before! [05:28:42 PM CDT] #C03C04 #C_FWSX #B737 #WESTJET #WJA1421 #WS1421 #ADSB #ADSBbot