Originally Posted by
LouieBOS
Are upgrades (miles + copay) on multi segment itineraries for PS flights treated like Polaris upgrades? Ie if SFO-EWR doesn’t clear but the next segment EWR-BOS does clear, you get a refund?
No if any segment of a mileage upgrade award is upgraded, then it is considered used. The only exception is if you only clear the non-Polaris segments when waitlisting on a Polaris marketed segment. As has been indicated above, Polaris marketing is not offered on any domestic flights. PS(Premium select? presuming you mean Premium Plus, as PS is Delta's product) and premium transcontinental business routings are not marketed as Polaris so they would not qualify for the exception.