An unusual 'system' in my view. At Hannover you first clear your luggage with security before checking in. This is done in the middle of the terminal. You are then not supposed to leave this 'secure' area until you have checked your bags in. However this simply doesn't work and people are able to leave (eg to the toilets) with their hold luggage labelled as 'security checked' and then check in. Another novelty (to me anyway) is that you don't go airside until you actually enter the holding lounge for your gate. So each gate has it's own secondary security check & immigration desk. Worth not going airside until the last possible minute in my view. Other than that a pleasant enough location with a good observation deck. The lack of a 'clear air' policy (same throughout Germany) means smoke gets everywhere!