We are probably 7-10km from an airport, but to the side, not in line with runway. We checked out the noise, multiple time a week for months prior to buying. We moved in. Then without warning the airport changes the flight paths to be over our house to make a few more pennies. It's been a bit painful to them so far (see link), and we will see how it goes. I set up an email template and just fill in the time and hit send to the noise complaints section at the council, aviation authority and local MP. It's quite therapeutic. They are installing a noise monitoring thing in our back garden this week at some expense (30k of gear they tell me). http://i.stuff.co.nz/travel/travel-troubles/9162498/Auckland...

I laughed at this, but to be fair, property is cheaper where it's noisier, so some people may not feel they have the choice.

Or move to the country and complain about roosters crowing!