The strong cost pressure of the market and safety issues faced by aerospace industry affect the development. Suppliers are forced to continuously optimize their life-cycle processes to facilitate the development of variants for different customers and shorten time to market. Additionally, industrial safety standards like RTCA/DO-178C require high efforts for testing single products. A suitably organized test process for Product Lines (PL) can meet standards. In this paper, we propose an approach that adopts Model-based Testing (MBT) for PL. Usage models, a widely used MBT formalism that provides automatic test case generation capabilities, are equipped with variability information such that usage model variants can be derived for a given set of features. The approach is integrated in the professional MBT tool MaTeLo. We report on our experience gained from an industrial case study in the aerospace domain.