American Express has a targeted offer giving a much higher bonus on the Amex Platinum card. Amex is offering a special bonus of 100,000 Membership Rewards points on the Amex Platinum card. 100,000 Membership Rewards points can go a long way towards earning free travel. The normal bonus is 50,000 points.
American Express Membership Rewards has many airline partners including British Airways. For a limited time Amex is offering a 40% bonus if you transfer Amex Membership Rewards points to British Airways Avios.