I just hope that this or other curfews don't, one day, end in tears with some poor souls at the pointy end making decisions to avoid breaking curfew and paying the ultimate price.
Even the thought of it sends a shiver...
The question that needs to be asked is "Was the airport there before you bought the property you are trying to protect from noise?" If the answer is "yes" then the response is "sorry, grandfathered right belongs to the airport, unless you want to pay to have it shifted?"
Overly simplistic, but watch these same folk that have caused this curfew get up in arms if their transit time to a relocated airport goes up to 2 hours plus.
Le Vieux