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Itavia Flight 870, sometimes referred to as the Ustica massacre (Strage di Ustica) was an Italian domestic flight from Bologna Guglielmo Marconi Airport, in Bologna to Falcone Borsellino Airport, in Palermo, Italy.

The plane lost contact with the Rome Area control center, which is based at Rome-Ciampino Airport, mid flight. This was confirmed after the recovery of the aircraft relict from the sea and a long analysis of the radar data. After losing contact, the fuselage broke up in two pieces and fell in the Tyrrhenian Sea.

Even though numerous decades have passed since the incident, numerous aspects of it still remain unclear, including the cause of the incident. Numerous hypoteses have been made reguarding the nature and cause of incident, these range from a terrorist bombing to a shootdown by a foreign military aircraft.

The ex President of Italy Francesco Cossiga and other Italian secret service sources have confirmed that the aircraft crashed as a result of the impact of a French missile, which hit the Itavia aircraft instead of a Libyan military jet.

The accident ultimately caused the failure of Itavia.

Aircraft
The aircraft, a McDonnell Douglas DC-9-15 flown as Aerolinee Itavia Flight 870, was manufactured in 1966 and acquired by the airline on 27 February 1972 with serial number CN45724/22 and registration I-TIGI (formerly N902H, operated by Hawaiian Airlines).

Flight history
On 27 June 1980, at 8:08 pm, the DC9 departed Bologna as flight IH870 with almost 2 hours of delay. Since Palermo was its destination, it was assigned the "Ambra 13" airway. The flight was regular until the last air traffic communication at 8:59pm. After talking with ATC, the aircraft reported that it was flying at 800km/h (497 mph), at 7000m (22965 ft). Its last known position was between the islands of Ponza and Ustica.

At 9:04 pm, ATC contacted the aircraft and gave it permission to start descending and prepare for landing at Palermo Falcone Borsellino Airport but the aircraft did not respond. Subsequently, two Air Malta flights, the Italian Air Force and the Palermo ATC tried to contact the aircraft, but to no avail.

At 9:25 pm, the air rescue comand of Martina Franca contacted the 15th Wing of Ciampino Airport, which holds some Silkorsky HH-3F helicopters for search and rescue operations.

At 9:55 pm, the first helicopter arrives at the last reported location of the aircraft. Numerous planes then search for the aircraft in the area, until a Breguet Br 1150 Atlantic of the Italian Air Force spots a large amount of fuel in the water and finds aircraft parts and passengers' corpses.

The next day, on the 28th, the first corpses are recovered.

Black box and radio comunications
The flight data recorder showed that before the incident the aircraft was flying at regular cruising altitude at a speed of 323 knots. The cockpit voice recorder showed that the pilots were unaware of any issues with the aircraft, joking and talking in a relaxed tone until the copilot exclaimed "Look! What is that?".

Official statements and litigation
The perpetrators of the crime remain unidentified. After hearings held from 1989 to 1991, the Parliamentary Commission on Terrorism, headed by Senator Libero Gualteri, issued an official statement concerning the crash of Flight 870, which became known as the "Ustica Massacre" (Strage di Ustica). Then the crash was referred by a "prima facie" judicial act to as "primarily an act of war, a de facto unreported war – as has been customary ever since Pearl Harbor, until the latest Balkan conflict – an international police operation, in fact, up to the great powers, since there was no mandate in this sense; a non-military coercive action exercised lawfully or illicitly, by one State against another; or an act of terrorism, as it was later claimed, of an attack on a head of state or regime leader.".

A number of Italian Air Force personnel have been investigated and tried for a number of alleged offences, including falsification of documents, high treason, perjury, abuse of office and aiding and abetting. None have been convicted. On 30 April 2004, Generals Corrado Melillo and Zeno Tascio were held to be not guilty of high treason. Lesser charges against a number of other military personnel were also dropped. Other allegations could no longer be pursued after the expiration of the statute of limitations, since the disaster had occurred more than 15 years before, which included charges against Generals Lamberto Bartolucci and Franco Ferri. In 2005, an appeals court ruled that no evidence supported the charges. On 10 January 2007, the Italian Court of Cassation upheld this ruling and conclusively closed the case, fully acquitting Bartolucci and Ferri of any wrongdoing.

In June 2010, Italian President Giorgio Napolitano urged all Italian authorities to cooperate in the investigation of the incident.

In September 2011, a Palermo civil tribunal ordered the Italian government to pay 100 million euros ($137 million) in civil damages to the relatives of the victims for failing to protect the flight, concealing the truth and destroying evidence.

On 23 January 2013, the Civil Cassation Court ruled that there was "abundantly" clear evidence that the flight was brought down by a stray missile, confirming the lower court's order that the Italian government must pay compensation.

In April 2015, an appeals court in Palermo confirmed the rulings of the 2011 Palermo civil tribunal and dismissed an appeal by the state attorney.

Terrorist bomb
After the series of bombings that hit Italy in the 1970s, a terrorist act was the first explanation to be proposed. As the flight was delayed in Bologna by almost three hours, a bomb's timer may have been set to actually cause an explosion at the Palermo airport, or on a further flight of the same plane.

The 1990 judicial inquiry was supported by a technical commission, led by independent investigator Frank Taylor. The technical commission's report concluded that an explosion in the rear toilet, and not a missile strike, was the only conclusion supported by the wreckage analysis. A test explosion in a DC-9 lavatory had shown the resulting deformation in the surrounding structure to be almost identical to that of the incident aircraft.

The technical commission's report was criticised in the Italian media by Corriere della Sera and La Repubblica. In particular it was stated that there was no evidence of explosive residue, per tests performed in 1994 by the Defence Research Agency in the United Kingdom.

Missile strike during military operation
Parts of the Italian media alleged that the aircraft was shot down during a dogfight involving Libyan, United States, French and Italian Air Force fighters in an assassination attempt by NATO members on an important Libyan politician, perhaps even Libyan leader Muammar al-Gaddafi, who was flying in the same airspace that evening. This version was supported in 1999 by Judge Rosario Priore, who said in his concluding report that his investigation had been deliberately obstructed by the Italian military and members of the secret service, in compliance with NATO requests.

According to the Italian media, documents from the archives of the Libyan secret service passed on to Human Rights Watch after the fall of Tripoli show that Flight 870 and a Libyan MiG were attacked by two French jets.

On 18 July 1980, 21 days after the Itavia Flight 870 incident, a Libyan MiG-23MS is said to have crashed in the Sila Mountains in Castelsilano, Calabria, southern Italy. According to Libyan Air Force sources, the pilot was a victim of hypoxia. As his aircraft's autopilot was activated, it just kept flying straight and level until running out of fuel, and eventually crashed in the Sila Mountains.

In 2008, Francesco Cossiga (Prime Minister when the incident occurred) said that Itavia Flight 870 had been shot down by French warplanes. On 7 July 2008, a claim for damages was served on the French President.

In 2023, former Italian prime minister Giuliano Amato said that France downed the plane while targeting a Libyan military jet in an attempt to kill Muammar Gaddafi. Amato said that Italy tipped off Libya about the planned assassination and consequently Gaddafi did not board the Libyan military jet.

Conspiracy theories
Several conspiracy theories explaining the disaster persist. For example, the vessel that carried out the search for debris on the ocean floor was French, but only US officials had access to the aircraft parts they found. Several radar reports were erased and several Italian generals were indicted 20 years later for obstruction of justice. The difficulty the investigators and the victims' relatives had in receiving complete, reliable information on the Ustica disaster has been popularly described as un muro di gomma (literally, a rubber wall), because investigations just seemed to "bounce back".

Memorial
On 27 June 2007, the Museum for the Memory of Ustica was opened in Bologna. The museum is in possession of parts of the plane, which are assembled and on display, including almost all of the external fuselage. The museum also has objects belonging to those on board that were found in the sea near the plane. Christian Boltanski was commissioned to produce a site-specific installation. The installation consists of: Each loudspeaker describes a simple thought/worry (e.g. "when I arrive I will go to the beach") All the objects found are contained in a wooden box covered with a black plastic skin. A small book with the photos of all objects and various information is available to visitors upon request.
 * 81 pulsing lamps hanging over the plane
 * 81 black mirrors
 * 81 loudspeakers (behind the mirrors)

Dramatization
The crash of Itavia Flight 870 was featured in the 13th season of the Canadian documentary series Mayday in an episode entitled "Massacre over the Mediterranean". The episode discussed the separate investigations into the event, and appeared to favour the investigation led by Frank Taylor, which concluded that the wreckage ruled out a missile and pointed to an explosion in or near the rear lavatory was the most likely.

A 1991 Italian film by Marco Risi, The Rubber Wall, tells the story of a journalist in search of answers to the many questions left open by the accident. The film theorises on a few possible scenarios, including the possibility that the DC-9 was mistakenly shot down during an aerial engagement between NATO and Libyan jet fighters.