I'm undecided on what to do with my Citi Hilton no AF card. I have more than 5 years history on it that I don't want to lose, but if that history will be erased and credit reports will show a new account after the conversion, then I'd rather cancel the card. I already have 5 AMEX credit cards including the free Hilton card so I'm not worried about not being eligible for the bonus in the future. But I'm just under 5/24 and don't want a new AMEX card count against that. I realize nobody knows for sure what will happen in the conversion, but history is the best guide.
When AMEX Costco cards converted to Citi, what did the credit reports show? Did the AMEX history disappear?