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The force that pushes a plane forward is called thrust, and it is produced by the engine.

To get more thrust, we need more powerful engines. For this, we turn to expert engineers who try to improve the performance of jets every day. They find way to increase the pressure inside the engine, so that the forward push is stronger. Some even work on creating better fuel. 

Another way to get the plane moving fast is to find was to eliminate drag, which slows planes down. To do so, we need to make the plane more aerodynamically shaped, so as to limit friction drag.