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

🇨🇦 C-GRTB - Boeing 737NG 800/W - WestJet WJA2137/WS2137, Licenciado Gustavo Diaz Ordaz (PVR) to Toronto Pearson (YYZ) - 4.2 mi away @ 36125 ft, heading NE at 574 mph. Spotted once before! [04:36:26 PM CST] #C0737C #C_GRTB #B738 #WESTJET #WJA2137 #WS2137 #ADSB #ADSBbot