Hi fellows ! Here is an interesting link I found which is a thorough report made by Boeing about Brussels Airport and the related regulation in terms of noise and use of runways.
The table of preferential runways is the most suprising item (even though it is well known for being a mess when seeing it I always find it amazing)....
http://www.boeing.com/commercial/noise/brussels.html
Boeing - Airport Noise and Emission Regulation Report
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