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Why are some air planes round, some oval and some older ones rectangular in shape?
When moving through the air, objects experience drag. Drag is the force of flight caused by air resitance, which pushes the planes back. In order to avoid drag, planes need to ba a very special shape: the teardrop has been found to be most efficient at reducing the pressure drag.
However, older planes were not made with this knowledge in mind, so they were made to be a little boxier, which was easier to make at the time.