Yesterday I flew from Kastrup airport, close to Copenhagen, to Paris. It was not the first time I took that flight, but this time I flew a different company than I usually do. Normally i fly Air France, this time it was SAS. Changing companies of course does something to your loyalty programme, but often it also means that you are traveling in a different type of plane. I like the Airbuses used by AF, or the the Boeings of Air Baltic, but yesterday I was transported in a McDonnell Douglas MD 81 (or 82). I've seen them often on Kastrup, but never realized a big design flaw they have. A design decision, I fail to understand. As an illustration, I took a picture of the view I had from my window, while seated towards the back of the plane, purposely not over the wings. And because the picture might be not very clear: yes, that is one of the engines. And yes, the sound was horrible.