how many upgrade certs do I need
This is my first year getting to AC's prestige level. Thinking about going to PEK in May of 2008. I understand that if I plan on using a system wide upgrade certificate (prestige level). That I need to book in Y,M,U class. However, how many certificates do I need for a return trip? Do I need to use 1 certifcate for each sector outbound to PEK and another PEK inbound. I don't mind paying the Y,M,U fare if I can fly return with one system wide upgrade coupon.
Since I haven't yet chosen my prestige rewards I was wondering if getting another reward option is better than the 2 system wide upgrade certificates.
Any thoughts