Maybe someone around here knows the answer... I've thought about it again and again, but I just don't know: when you come into the airport on the train (S-Bahn) - well, most likely you'll also be able to see it from a car - there's a building on the right hand side (just before you reach the "Besucherpark" station) right where the cargo area is, and it has a blue lit neon-sign saying "Night Flight" on it.

Just curious: does anyone here know what that is?

Regards,
Frank