I remember that when I was hired by Air Canada 32 years ago, I would sit outside the Dorval airport at the Hilton in Dorval and listen to all these wonderful DC-8s, 727s, DC-9s and 737s take off, and I love airplane noise. That's why I got into aviation. To hear the thrust of these engines was magnificent.
I go out there now, and you don't really hear anything. That has changed. Technology has changed the airline industry. We hear more about the noise now, and that's for various reasons, but the airplanes themselves are 90% quieter, I believe, in some cases. I miss it personally, because I like airplanes that make noise, but the airplanes are far quieter now than they were before.