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

🇨🇦 C-FFPH - Boeing 737NG 81D/W - Smartwings SWG572/WG572, Los Cabos (SJD) to Toronto Pearson (YYZ) - 4.2 mi away @ 35175 ft, heading ENE at 524 mph. Spotted 2x before! [08:14:06 PM CST] #C00EC2 #C_FFPH #B738 #SWG572 #WG572 #ADSB #ADSBbot