jet airplane - A fast airplane with special engines that do not use propellers., propeller - A set of blades that spin to help older airplanes fly., engine - A machine that provides power to make something move or work., sucks in air - Pulls air inside, like a vacuum., speed of sound - The speed at which sound travels, about 767 miles per hour., big boom - A loud noise made when something travels faster than sound., lift off - To rise into the air, especially when a plane begins to fly., flies faster - Moves through the air at a higher speed., built all the time - Made frequently or continuously., stay high - Remain at a high altitude in the air., gets pushed out - Is forced out of something, like air leaving the back of a jet., proven - Shown to be true through evidence or testing., with ease - Done smoothly and without difficulty., being built - Currently in the process of being made., quit - To stop working or functioning.,

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