Berlin is the capital of Germany. The city has ratings ranging from 175-250 and sometimes going as high as 300. Tourist ratings are slightly higher than business ratings.
The default airport is Berlin Tegel Airport (TXL).
Berlin has fairly good ratings for a European city. You should have a eye on it as one of the most important cities in Europe. This, along with most players prefering nearby Frankfurt or Munich, makes this a good place for your first hub. There may be mild to moderate competition, but the city can generally sustain it. The city can connect to many major European cities such as London, Paris, Istanbul and to Asian cities such as Beijing and Guangzhou with adequate range planes.
Berlin Tegel Airport usually achieves maximum slot usage 15 to 20 years into the game. As such, buying the airport is recommended during the economic crisis. Additional airports will rarely achieve a status beyond Level 3 or 4 rather than growing to level 6 or 7 and should not be built unless better options are exhausted.
Large planes such as the Airbus A380, McDonnell Douglas MD-11 and Boeing 777 are optimal on high-occupancy routes to distant cities. For routes to nearby cities, use medium-sized planes such as the Lockheed L-1011, Boeing 767 and Tupolev Tu-154. Small-sized planes are not recommended unless early in the game as they will not meed the city's high demand.