Elevators 

The elevators are at the back of the plane, on its tail end. Its job is to control the pitch of the plane.  Same as ailerons; a pilot uses a control wheel to make the elevators rise and lower. When the pilot lowers the elevators, the plane's nose goes down which makes the plane go down. Same with raising the elevators, but making the plane go up. They play a big part in landing the plane because they are in control of most of the landing.