It would almost appear as if Berlin has gone from 3 perfectly functioning airports, each filling a role/niche and each with a role to play in the city's future... To two over-stressed, over-capacity, under-invested airports which by all accounts are in a complete state right now due to the fact that they are struggling to cope... Oh and lets not forget the outrageous white elephant which itself seems to have very little place in Berlin's future, be it short term from which it will be completely absent, or long term where it will probably need immediate expansion. Expanding Tegel probably doesn't seem like such a bad idea now