Longitudinal stability refers to an aircraft's ability to maintain its balance and control along its length during flight. This stability ensures that the aircraft does not pitch excessively up or down, which can lead to loss of control. It is primarily influenced by the design of the aircraft, including the placement of the center of gravity and the wings. In practical terms, an aircraft with good longitudinal stability will return to its original flight attitude after being disturbed by external forces, such as turbulence. This characteristic is crucial for safe and efficient flight, allowing pilots to manage the aircraft more easily and reducing the risk of accidents.