Birds flap and find a way to fly. They are able to control their wings to push up and go forward. With airplanes, humans are able to fly too. The materials used to make planes, sink in water. With jet engines and streamlined shapes, magically, all the heavier than air parts of the plane are able, together ,to get us airborne. Our feet are no longer gravity-glued to the ground. We Earth-Lings are now Sky-Lings. Airplane wings still have wing parts called flaps.