What allows an aircraft to be operated easily and to withstand the stresses imposed on it?

Maneuverability is the characteristic of an aircraft that enables it to perform various maneuvers and changes in flight path efficiently, allowing for easier operation in different flight conditions. It refers to how well an aircraft can respond to pilot inputs and change its flight attitude or direction. High maneuverability is especially important for performing aerobatic maneuvers, making rapid turns, or adjusting to avoid obstacles.

While stability refers to an aircraft's ability to return to a steady state after being disturbed, controllability encompasses how well a pilot can direct the aircraft's attitude and trajectory in response to inputs. Speed is more about the performance aspect of flight rather than the operational ease or ability to endure stresses. However, maneuverability directly impacts how well an aircraft can adapt to various flight situations, which ultimately contributes to both ease of operation and its ability to withstand the physical stresses encountered during flight.