Originally Posted by
alexperi
If I get a certificate using one of my GPUs, but then fail to make the upgrade on the flight itself, will the GPU be restored to my account, or have I lost the GPU for ever?
From Terms and Conditions on SWU (got it before 3/3).Unused certificate has to be mailed to the Mileage Plus Service Center for redepositing and will have the expiration date of the original upgrade.
And it's one segment upgrade.