Originally Posted by
lsquare
If not and I'm departing from a Canadian airport, but connect via a US airport to my final destination anywhere in the contiguous US, how can I take advantage of the certificate?
You can find the T&C here:
https://www.delta.com/us/en/booking-...n-certificates
"Companion Certificate is valid for one round-trip ... companion ticket with the purchase of certain adult round-trip fares on published routings within the 48 contiguous United States. Residents of Hawaii, Alaska, Puerto Rico or the United States Virgin Islands (USVI) must originate from there to the 48 contiguous United States and have an address on their SkyMiles account in Hawaii, Alaska, Puerto Rico or the USVI."
I doubt it is combinable on a single ticket. You'd have to book a separate positioning ticket. DL will protect across separate tickets though, so this is probably ok if you decide this is worth it.