Qantas assigns FF numbers sequentially -- mine was in the first million so it's six digits. So any number is associated with someone's account. Other schemes s

Qantas assigns FF numbers sequentially -- mine was in the first million so it's six digits. So any number is associated with someone's account. Other schemes seem to assign only a tiny fraction of possible codes, which is why my Starwood number is twelve digits long. I don't see any reason why they should do that.