I am pretty sure that in the past I have used a companion voucher on a domestic open-jaw but had to call in. Anyone know if you can do something like YYZ-YVR // YVR-LHR on a single companion voucher? Not so much interested in getting the YYZ flight for "free" as I am in getting the YVR-LHR segment as a half round trip fare instead of a one-way fare, which has a $400 premium on the dates I was hoping to use my voucher for a one-way YYZ-LHR.