Flexible Rewards Credit Cards
American Express Membership Rewards Cards
American Express Premier Rewards Gold Card American Express Business Gold Rewards Card American Express Everyday Card American Express Everyday Preferred Card American Express Platinum Card American Express Business Platinum CardAmerican Express Starwood Preferred Guest and the American Express Starwood Preferred Guest Business
I am listing these cards as Flexible Rewards Cards here (as well as a Hotel Cards) in that it offers 5,000 bonus points for every 20,000 points transferred to a variety of airline programs.