Movement of an airplane along its lateral axis (roll) is controlled by:

The movement of an airplane along its lateral axis, known as roll, is effectively controlled by the ailerons. Ailerons are located on the outer trailing edges of each wing and operate in opposite directions to create a differential lift. When one aileron is deflected upward, it decreases the lift on that wing, causing it to drop, while the other aileron, deflected downward, increases lift on the opposite wing, causing it to rise. This rolling motion is essential for maneuverability during flight, allowing pilots to bank the airplane during turns.

In contrast, other flight control surfaces such as the rudder, elevators, and flaps serve different primary functions. The rudder affects yaw, controlling the airplane's movement around its vertical axis. Elevators are responsible for pitch, controlling the nose up or down, and are crucial for climbing or descending. Flaps are used primarily during takeoff and landing to increase lift at lower speeds, but they do not influence rolling motion. Understanding these differences is crucial for comprehending how each surface contributes to the overall control of an aircraft.