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Many parts of a car are not obligatory. They are attached or formed to make the car look better.

Are aeroplanes(especially airliners) only designed for function or are there any parts that are purely for aestethical reasons (On the outside of course)?

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    $\begingroup$ Which planes? GA, gliders, airliners, military? Indeed GA planes include some aesthetically aspects. Military, not sure. $\endgroup$ – mins May 16 '17 at 6:49
  • $\begingroup$ I am interested in every type of plane. $\endgroup$ – Noah Krasser May 16 '17 at 6:54
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    $\begingroup$ This is quite broad, a single answer may not cover marketing and technical aspect for all kinds of buyers. For airliners: Why is there really only one basic design for passenger airplanes? Now there is a big discussion about nose differences between Airbus and Boeing: Is the shape choice technical or aesthetic? Same for tail design at Mooney. $\endgroup$ – mins May 16 '17 at 7:02
  • $\begingroup$ @mins Ok, I limited it to Airliners. $\endgroup$ – Noah Krasser May 16 '17 at 7:20
  • $\begingroup$ I don't know about now, but nobody can tell me there wasn't an element of aesthetics in the design of the Spitfire. $\endgroup$ – Alan B May 16 '17 at 9:50
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The question is very broad so I gave a quick overview, please comment and I will elaborate further by editing my answer. Jet liners are purely designed for function, they are all about transporting x amount of passengers for the lowest cost per mile. That trend started after the oil crisis. The Boeing 747 was originally developed as a cargo airplane such that when we would by flying supersonic they could be converted from pax to cargo. This all went south and supersonic flying was not the future anymore. The 777 program was one of the first jet fully optimized to fit as many pax in it as possible, just look at two seat plans, one for the 747 and one for the 777 Boeing 747-400 Boeing 747 Boeing 777 Boeing 777

As can be clearly seen by the picture above is that the 777 has far less space left with no seats thus fitting in more pax per square meter.

In the private jet world design is still functional but there is more freedom to waste some fuel on unnecessary bits if this makes your aircraft stand out. This would result in aircraft like the: Beachcraft Starship Beachcraft Starship Piaggio Avanti Piaggio Avanti

They both feature a more complex design involving a Canard configuration which has advantages but also major drawbacks

Moving over to private jets a similar trend as in the civilian market can be seen where designs are more alike due to the simple fact that jets are expensive and you will most probably only see the inside as it is parked in a hangar anyways and you can't drive it over the boulevard so everyone can see it Honda Jet Honda Jet, interesting looking aircraft but still mostly functional as mounting the engines aft reduces the noise inside the cabin, high mounted engines allows for unpaved runways and reduces the risk of FOD from the runway.

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  • $\begingroup$ I can add that currently even if an aircraft is designed to accomodate lounges or maybe gym (A380 was originally presented with this kind of features due to large space), airlines quite always prefer to fit them with seats and not this kind of amenities, to maximise profit $\endgroup$ – Luca Detomi Dec 14 '18 at 8:58

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