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

🇨🇦 C-FSKZ - Boeing 737MAX 8 - Air Canada ACA999/AC999, Montréal-Pierre Elliott Trudeau (YUL) to Licenciado Gustavo Diaz Ordaz (PVR) - 4.5 mi away @ 33175 ft, heading SW at 508 mph. Spotted 3x before. [11:02:14 AM CST] #C030A6 #C_FSKZ #B38M #AIR_CANADA #ACA999 #AC999 #ADSB #ADSBbot