Taking DB Regional Instead

Taking the S-Bahn to and from Shönefeld is a pain in my bum so I am loaded on the local regional train to Berlin-Hauptbahnhof, my home station, with zero transfers -- so, hopefully is all work smoothly and swimmingly -- the train is already "zwanzig Minuten" late, which is terribly un-German. Looking forward to sleeping in my own bed, though my hotel was very nice. By the way, it costs the same fare to go from Flughaven Berlin-Shönefeld to Berlin-Hauptbahnhof via DB Regional with zero transfers as it does to take the S-Bahn to Ostkreutz and then transfer once to get to Hbf: €2.80: toll!