I'll answer in French, if I may.
Until now, I believe that the airport authorities have failed in their responsibilities to be good neighbours, at least with respect to Pierre Elliott Trudeau International Airport.
This is a very broad question you are asking, and it concerns the balance between the economy and public health. Montrealers affected by noise pollution, particularly aircraft noise, are certainly seeing their productivity decline. Indeed, unable to sleep, they enter the workplace tired or call in to inform their boss that they won't be in to work. This has an economic impact.
We can't go back to the Middle Ages, when people died at age 30. We are in the 21st century, and airport authorities in Canada are behaving as if we were in the Middle Ages. It is up to Parliament to bring these people to their senses. There is an imbalance at the moment, not on the economic side, but on the environmental and public health side. These people affected by aircraft noise and suffering from psychiatric problems will need to be treated. You will therefore have to increase taxes to add beds in hospitals.