Originally Posted by
Cathay Boy
My instinct would say CX since this seems like a policy that they take care of their own. If any OW members birthday counts, CX is really throwing away a lot of upgrades here.
Also, I remember Guy said he tried it once SIN-HKG with AA numbers and was not given a upgrade. (Then again this is "Singa-ByTheBook-pore" so I'm not really that surprise.)
But then the basic GR membership won't get you anything either, I think you need to be at least silver for a chance of birthday upgrade.