Northwest WorldPerks has teamed up with Thanks Again LLC to offer members miles when they shop at Thanks Again Rewarding Merchants such as dry cleaners, day spas and car washes. The Thanks Again merchant network has more than 2,200 local merchants in more than 30 states and is expanding in 2008 to include additional “everyday spending” merchants like clothing care, auto care and personal services like hair and nail salons, day spas, gyms and more. WorldPerks members who register their WorldPerks credit card with Thanks Again can effectively earn double miles with their Thanks Again purchases. Members will earn 500 WorldPerks miles for their first transaction and one mile per dollar for other Thanks Again transactions. Thanks Again has similar partnerships with American, Continental, United and US Airways.