Brain Fade,. .. .Ryanair is already involved in litigation with German carrier Lufthansa over its base at Hahn airport, about 100 kilometres from Frankfurt, Germany. . .. .Last month, a court ruled that Ryanair can advertise its new base as 'Frankfurt-Hahn' but another court in Cologne issued a preliminary injunction on Ryanair to stop it comparing fares from Hahn with Lufthansa's fares from Frankfurt airport.