The head of Ryanair's top low-cost airline, Michael O'Leary, has returned to Bratislava after half a year. He announced that he was adding an alsian-based liner to the service. From the end of October, there will be a lot of people here. The carrier is preparing for the strongest winter season in the main city with a new service to Turin. This explains to the team that Vienna is expensive for them and, consequently, a European environmental bill…