Air Berlin PLC & Co. Luftverkehrs KG (stylized as airberlin or airberlin.com) is Germany's second largest airline, after Lufthansa, and Europe's seventh largest airline in terms of passengers carried. It operates an extensive network including holiday destinations in the Mediterranean region, the Canary Islands and North Africa as well as intercontinental destinations in Southeast Asia, the Caribbean and the Americas. The airline is a member of the Oneworld alliance, its Austrian subsidiary NIKI is an affiliate member of Oneworld. Air Berlin concentrates on serving major German and European cities to attract business traffic. A total of 25 German cities are served, more than any other airline. Its hubs are Berlin-Tegel Airport and Düsseldorf Airport. The airline is headquartered at the Airport Bureau Center in Charlottenburg-Wilmersdorf, Berlin.