Follow up to an earlier question I had on GPU's. I have two that expire 1/31/14. I found a friend who wants to use them for her parents. Their flights are 1/21/13 returning on 2/8/14. They already have upgrades for the 1/21/13 flight - can I use my GPU's for the return flights on 2/8/13, after the expiration? Hoping that b/c their outbound flight is before the expiration I'll get through.