Okay, maybe most people won't think this is worth the trouble. But to me 1,000 or 1,500 miles is worth a little bit of effort. Lots of airlines have dining awards where you can earn 1,000 or 1,500 miles with your first Dine out at one of their restaurants for $40 or more. You generally also have to post a review of the restaurant within a certain time frame. So I've got AA, UA, US Air, cards and the wife has the same. Seems easy enough to get 1,000 miles for each of these cards/accounts. Use a different email just in case (aliases in hotmail work well here). They all have different frequent flyer numbers so no problem. Credit card, email and FF# are all unique. Great. Do the same for the wife's cards--get yourself added as an authorized user on each of them, use that card to do the spend, but have the miles post to her account. Great. Okay, now... you get a new UA, AA or US Air card. You've already done say UA before. You create a new UA account you plan to merge with your normal FF# eventually. You're careful to make sure it has the same name and such so there won't be any issues with the merge. You start thinking about bckstgr and other ways of getting miles for new accounts and using that new FF# for those. Anyway, after a while you have a few miles in this account and you merge. Does UA give you any grief? Anybody ever run into issues doing this?