In jet aircraft, an overspeed results when the axial compressor exceeds its maximal operating rotational speed. This often leads to the mechanical failure of turbine blades, flameout and total destruction of the engine.

Flying an aircraft faster than its designed structural or aerodynamic limits can lead to severe consequences, primarily structural failure or loss of control. Every aircraft has a specific "Maximum Operating Speed" (VMO​) and "Maximum Operating Mach Number" (MMO​). If these are exceeded, the aircraft may experience aeroelastic flutter, which is an uncontrolled, high-frequency vibration of the wings or tail surfaces that can snap the airframe in seconds. At high speeds, the dynamic pressure on the wings can also cause structural deformation, where the metal skins may buckle or flight control surfaces like ailerons can "reverse," meaning the plane rolls in the opposite direction of the pilot's input. For subsonic jets, approaching the speed of sound causes "Mach tuck," where a shockwave forms on the wing, shifting the center of pressure and causing the nose to pitch down violently. Modern "fly-by-wire" aircraft like the Airbus A350 have "flight envelope protection" that prevents the pilot from exceeding these speeds, but in extreme descents or emergencies, overspeeding remains a critical danger that can turn a manageable flight into a catastrophic structural breakup.