By plain, We have 2 main Airports, Tegel (TXL) and Schönefeld (SFX).
best way to getting around is by bus or metro or during the summertime by Bicycle
Interminal border crossings at East German checkpoints can be averted by taking a plane to Berlin Tegel, just like during the Berlin airlift!
Berlin has a great train, subway systems, plus there are buses as well as bike lanes everywhere. It is one of the best organized cities in Europe, when it comes to transportation, it is just superb.