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

🇨🇦 C-GEMV - Boeing 737MAX 8 - Air Canada ACA581/AC581, Montréal-Pierre Elliott Trudeau (YUL) to George Bush Intcntl/Houston (IAH) - 4.5 mi away @ 39125 ft, heading WSW at 403 mph. Spotted 5x before! [05:50:16 PM CDT] #C05086 #C_GEMV #B38M #AIR_CANADA #ACA581 #AC581 #ADSB #ADSBbot