German carmaker BMW and car supplier Bosch [ROBG.UL] said on Saturday they would join Deutsche Bahn [DBN.UL] in two claims for about 2.1 billion euros ($2.4 billion) in damages from air freight carriers who were involved in a cartel. The air cargo cartel, which included Europe’s biggest airline Lufthansa and British Airways, was first discovered seven years ago and triggered fines in the European Union and in the United States.