Thanks for the welcome! This is the return leg of my flight. LHR>YYZ, 3 hours at YYZ, then YYZ>SFO.
Trying to figure out the best way to stop over in Toronto, and take a flight from YYZ to SFO later. Was hoping to use the "no charge Toronto layovers" promotion, but no one at Air Canada or my booking agency can seem to figure out how to implement that.