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

🇨🇦 C-GRAG - Boeing 737MAX 8 - WestJet WJA2537/WS2537, Cancun (CUN) to Winnipeg James Armstrong Richardson (YWG) - 4.7 mi away @ 36800 ft, heading NNW at 573 mph. Spotted once before. [05:15:02 PM CDT] #C07193 #C_GRAG #B38M #WESTJET #WJA2537 #WS2537 #ADSB #ADSBbot