What is the one way cost for the S1 or S8 trains to and from the airport from the center? Are tickets sold in DB machines? How frequently do they depart? What is the journey time? Do we need to stamp our tickets at the platform before getting on? Is it open seating? In both directions are the airport and hauptbahnhof stops announced in English clearly so one can not miss getting off at the right stop or are they the last stops on these lines?
How long before departure time should we arrive at the airport for international flights?