Amex is doing what it can to capture your holiday spending with even more promos. In addition to this double membership rewards promotion and this one, there’s this offer that gives you 5X more Delta SkyMiles points on your purchases between November 15 and December 31, 2006 for select SkyMiles credit card holders. Alternatively, you can call 1-888-632-0093 and mention promo code H506:0001 to sign up.

There is also yet another double membership rewards promotion that is active, where you can earn double points on eligible retail purchases made in November and December. If your card is eligible, you can enroll it online here.