It takes a lot of time and effort to design a new airplane or to make an existing airplane more safe or more efficient. Before going on, you might want to first read about what aeronautics is and how an airplane flies .
Every airplane goes through many changes in design before it is finally built in a factory.
These steps between the first ideas for an airplane and the time when it is actually flown make up the design process. Aerodynamics is the study of how air flows around an airplane. In order for an airplane to fly at all, air must flow over and under its wings. The more aerodynamic, or streamlined, the airplane is, the less resistance it has against the air. If air can move around the airplane easier, the airplane's engines have less work to do.