Beluga isn't that special, if you live where they come and go daily, sometimes several times. Rather annoying, because loud. At least louder than an A380, which is really big, but not as loud.
One time I heard a different-sounding plane, I looked up, and it was one of them flying a different path than usual on their routine flights from Tolouse to Hamburg (Airbus sites), sadly it seems they haven't repeated that.
