LINK. oneworld Welcomes Its Newest Member. Airline: airberlin Award: Double Miles Bonus Code: ABDBL Register today by selecting the red "REGISTER" button below. Dates: Travel between March 20, 2012, and May 15, 2012. Offer: In celebration of airberlin's inauguration into the oneworld alliance, members of American's AAdvantage® program can earn double miles every time they fly an eligible fare* on airberlin between March 20 and May 15, 2012. airberlin's entrance into oneworld adds even more travel options for AAdvantage members and adds more cities to AA's network through codesharing. Some highlights include Cologne/Bonn, Dortmund, Dresden, Erfurt, Florence, and an additional 45 destinations. Learn more Register prior to travel by clicking the red register button below and watch your miles add up! AAdvantage membership is free, and if you are not already a member, this is a great time to join. It's easy to enroll at www.aa.com/enroll. * Offer applies to fares booked in J, C, D, I, Y, B, H, K, M, L, V or N Terms and Conditions: AAdvantage double mile offer is valid on airberlin operated and/or marketed nonstop flights, March 20, 2012, through May 15, 2012. Includes travel on codeshare flights marketed by American Airlines (booked under the AA flight number). Offer applies only to AAdvantage members who purchase and fly on eligible published fare tickets. Bonus miles do not count toward elite status qualification and will be calculated at 100% of the base miles earned. Registration prior to travel is required.