http://www.hyatt.com/hyatt/specials/offers/offer-details_hotels_20.jsp?offerId=39706990 There is no special booking code or rate, and the 3% regular OPEN savings still apply. Strangely, the T&C that this page directs to is the general T&C for the Hyatt AmEx OPEN bonus. Part of this is the $500 annual maximum in OPEN savings, towards which this $100 would presumably count, so if you maximize the OPEN savings without it, you might be missing out towards year-end. When you use your American Express OPEN® Card at Hyatt Hotels & Resorts® between May 15 and August 15, 2011, you can earn a $100 statement credit when you spend $650 or more. No enrollment is necessary, and your credit is in addition to your automatic 3% OPEN Savings® discount. With urban, suburban and airport locations across the country, Hyatt Hotels & Resorts is the premier choice for productive business travel with exceptional service, world-class amenities and award-winning cuisine. Book now or 1-800-914-OPEN(6736) to enjoy extra savings.