A related question: I recently got a Citi AA Platinum Select card, which has an annual fee. A phone agent said that I can convert it to another card - in this case, a Citi MileUp card with no annual fee.

The question is, if I do that conversion, will I keep the same card number and the associated virtual card numbers? The agent said sometimes that happens and sometimes it doesn't, but she doesn't know why.

To do a conversion, I'd have to hold it for at least a year, which would mean an annual fee. But if I convert within 37 days after the fee is charged, it will be credited back.

It probably makes more sense to get a new MileUp card, with 10,000 mile and $50 credit bonuses, and change all the automatic payments from the old card number.