Visitors to Berlin will need to know that there are very serious disruptions to Berlin’s normally excellent public transport network. The main east/west Sbahn will not be operating for at least the next two weeks, i.e., until 3rd August 2009. It will also not be possible to travel to or from Sch?nefeld airport by Sbahn. Instead travellers will need to use the Airport Express, bus or taxi. The Ubahn does not serve the airport so travellers will need to get a bus from Rudow Ubahn station.
I hope this helps.