I noticed yesterday that Rewards network which runs the dining rewards for number of programs, IHG, Delta, AA, etcc. Now has limit on the number of credit cards you can add to your account for earning dining rewards. The limit seems to be 5 cards. I presently have 17 cards registered (friends, family members, and coworkers who don't wish to earn miles), and when I went to add another card I was unable too. I then checked my wifes account and hers too had a five card limit, but with only four cards so I was able to add one more to hers. It appears they are allowing you keep the cards you have even if more then 5, but you can not add any more. So I guess the strategy would be to not delete any cards if your already have over 5 and if you need to change a card just edit the current card you have on file. Q. How do I register additional credit cards? A. You can add or change credit and debit cards, and update any of your other personal membership information by visiting your My Account Center located on the Web site. You can register up to 5 credit/debit cards in total.