Linked from
The 12 pages that link to Aircraft stability, each with the reason it gives.
AircraftRelated: Stability determines how an aircraft responds to changes in pitch, roll, and yaw.
Aircraft designRelated: Stability requirements influence wing, tail, and control-surface sizing.
Jet aircraftRelated: Stable handling helps jet aircraft maintain predictable flight.
AeronauticsRelated: Stability determines how the aircraft responds to gusts and control inputs.