What happened
On a scheduled evening flight departing from Bologna Airport for Palermo, a DC-9 carrying 77 passengers and 4 crew members vanished from radar at an altitude of 24,000 feet. No distress signal was transmitted by the crew prior to the loss of contact. Following the disappearance, search and rescue operations located debris and remains in the sea approximately 25 km northeast of Ustica Island, north of Sicily. The primary wreckage eventually settled on the seabed at a depth of 3,500 meters.
In April 1987, Italian investigators recovered fragments of the wreckage, which revealed traces of T4 explosive material. Various theories have emerged regarding the destruction of the aircraft. One hypothesis suggested that two unidentified fighter jets were present in the vicinity and that an air-to-air missile strike caused the mid-air explosion. Another theory, discussed following statements by former Italian President Francesco Cossiga, proposed that the aircraft might have been targeted by a French missile during a mission to intercept a high-profile individual believed to be on board.
Findings
Investigations have produced conflicting conclusions over several decades. While early theories focused on aerial combat involving unidentified jets, a 1994 official report suggested the DC-9 exploded due to an explosive device planted on the aircraft. Despite the discovery of explosive residue, the precise mechanism behind the destruction remains a subject of intense debate. The incident resulted in 81 fatalities, and the definitive cause of the disaster has never been officially established.