Citi is offering 35,000 bonus miles for new card members that make $750 in purchases within the first fourth months of card membership. The annual fee is even waived for the first year. This offer is valid for the personal American Express and Mastercard, as well as the business Visa card.
This is definitely the best Citi AAdvantage offer I’ve ever seen, though unfortunately these cards can’t be churned anymore, so it is for first time cardholders of each type of card only. So my understanding is that if you’ve had a Mastercard in the past, you can still get the bonus for an American Express, for example.
(Tip of the hat to Gary)