Orval Fairbairn wrote:

Do indicidual cities or states in Germany restrict your aircraft
equipment? If so, that is pure chaos!

No chaos at all. There are "noise classes", and each aircraft has a
noise certificate which states in which class it is. When landing, you
pay a landing fee and a noise surcharge, the latter depending on the
noise class stated in that certificate. (Easier spoken, the landing fee
depends on the noise.) There are some airports which are forbidden for
the noisier planes, this is stated in the AIP.

Stefan