Air Berlin Joins Oneworld Frequent-Flier Alliance CheapOair Staff July 27, 2010 Trending Stories Air Berlin joins oneworld alliance Low-cost, German carrier, Air Berlin has accepted an invitation to join the oneworld frequent-flier alliance. With that, the airline becomes the first big low-cost carrier to join one of the three large global airline alliances, Dow Jones says. The other alliances are the Star Alliances and Sky Team. Additionally, oneworld states in a press release that Air Berlin plans to “develop co-operative agreements with group members American Airlines and Finnair.” Source: USA TODAY