tedhl,

Your comment about the Asia miles program relates to my confusion. The brochure I saw appeared to be a generic oneworld type offering. It listed the logos of all the oneworld members, but not some of the Asia miles participants that are not in oneworld. Moreover, it made reference to each program having slightly different terms relating to the offer.

This would seem to explain the Asia miles promotion you mention, but also seems to imply that a member of AA's or BA's program, for example, could also get double miles, simply by having a SIN address. I don't recall anything on AA's website about this, but maybe they did a targeted mailing to SIN residents already in their database.