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

🇨🇦 C-GTSW - Boeing 737MAX 8 - WestJet WJA1978/WS1978, Saskatoon John G. Diefenbaker (YXE) to Orlando (MCO) - 4.3 mi away @ 37575 ft, heading SE at 643 mph. Spotted 2x before! [04:12:27 PM CST] #C078BF #C_GTSW #B38M #WESTJET #WJA1978 #WS1978 #ADSB #ADSBbot