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Northwest Airlines flies worldwide through a network of 24 international affiliate airlines. Northwest's WorldPerks program is connected to a network that includes car rental agencies, communications companies, dining and entertainment, financial service companies, hotels, real estate agencies, and retail outfits. Travelers can earn and redeem mileage through any of the WorldPerks affiliates. Northwest also offers discount airfare for special events, like child adoption travel, business meeting travel, and group travel, and a number of special services for businesses like cargo and shipping, as well as special offers for small or medium sized businesses through the Biz Perks program. To reserve airline tickets, vacation packages, or learn more about Northwest Airline's WorldPerks program