I'm looking to purchase our 10 day park hopper tickets with Airmiles for our trip next year and want to make our park reservations. Does anyone know ff we end up not taking our trip how long are the tickets valid for? Will we be able to use them on another trip? Lastly, can they also be used to upgrade to an annual pass if and when Disney starts selling them again? And does this have to be done at the park or can it be done over the phone before the trip?