Just wondering if these devices are only issued to people who had houses in that area before the airport was built. IMO if you knowingly purchase a residence under a flight path, you lose any privilege of complaining about the noise.
Modern aviation is already far quieter, and there are plenty of regulations in place to minimise the noise footprint (e.g. modern fanjet engines are far quieter than the older turbojets, most airports have curfew hours to prevent late night/early morning noise, plus I know at our local airport, aircraft cannot use reverse thrust braking when landing in the early morning hours etc.).
Modern aviation is already far quieter, and there are plenty of regulations in place to minimise the noise footprint (e.g. modern fanjet engines are far quieter than the older turbojets, most airports have curfew hours to prevent late night/early morning noise, plus I know at our local airport, aircraft cannot use reverse thrust braking when landing in the early morning hours etc.).