CAGAYAN DE ORO, Philippines (Reuters) - Air force pilots on Tuesday spotted the smashed remains of a DC-9 plane that slammed into a mountain with 104 people aboard but saw no survivors in what could be the country's worst air disaster, an air traffic control official said. "It appears that the aircraft disintegrated on impact," chief air controller Artemio Cruz told Reuters. Officials said the remnants of the twin-engine Cebu Pacific Air plane were sighted at an elevation of 6,800 feet (2,060 metres) near the peaks of Mount Sumagaya, about 40 miles (64 km) northeast of Cagayan de Oro airport. The plane, on a flight from Manila to this southern city, vanished on Monday shortly after its pilot radioed ground control that it was at 11,500 feet and preparing to descend. The wreckage was found only on Tuesday. Officials said soldiers, police and volunteers were trying to reach the crash site but they were being hampered by the forbidding terrain and cold temperatures. Turbulent winds also prevented helicopters from hovering over the crash scene. An airline spokesman said the plane passengers included five people with non-Filipino sounding names as well as five children.