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

🇨🇦 C-FDHU - Airbus A330 343E - Air Canada ACA779/AC779, Montréal-Pierre Elliott Trudeau (YUL) to Los Angeles (LAX) - 5.0 mi away @ 42550 ft, heading WSW at 507 mph. Spotted for first time! [08:35:24 PM CDT] #C008B7 #C_FDHU #A333 #AIR_CANADA #ACA779 #AC779 #ADSB #ADSBbot