Accidents where the aircraft is out of control at the time of impact, because of mechanical failure or pilot error, are not considered CFIT (they are known as uncontrolled flight into terrain). Accidents resulting from the deliberate action of the person flying the aircraft, such as acts of terrorism or suicide by pilot.
According to Boeing, CFIT is a leading cause of airplane accidents involving the loss of life.[3] It has caused over 9,000 deaths since the beginning of the commercial jet age.[3] CFIT was identified as a cause of 25% of USAF Class A mishaps between 1993 and 2002.[4]