But this was never to happen: on 15 July 1974 right wing Greek nationalists overthrew the democratically elected president of Cyprus, Archbishop Makarios. Nicosia Airport was briefly closed by the coupists, then used on 17 July 1974 to ferry troops from Greece to Cyprus to support the coup against Makarios. Only on 18 July was it allowed to reopen to civilian traffic, becoming a site of chaotic scenes as holidaymakers and other foreign nationals tried to leave the island. Finally, on 20 July 1974, Turkey invaded Cyprus, bombing the airport heavily and a ground attack of multiple battalions also ensued. However, the Hellenic Force in Cyprus and Cypriot National Guard Special Forces defended against the attack. After the invasion the airport came under UN control, and it is still under UN control to this day. The leaders of the Greek Cypriot Community and Turkish Cypriot Community discussed reopening Nicosia International Airport at the beginning of 1975. After the leader of the Greek Cypriot community, Archbishop Makarios, had initially rejected the Turkish Cypriot proposal to reopen the airport to international traffic under joint control, agreement to reopen it was 'in principle' reached during the negotiations in Vienna from 28 April to 3 May 1975. However, discussions by a joint committee set up for that purpose were unproductive. The last commercial airline flights out of Nicosia Airport took place in 1977 under UN Special Authorisation, when three of the remaining Cyprus Airways aircraft stranded there since the 1974 invasion were retrieved by British Airways engineers and flown to London. One of these, a Hawker Siddeley Trident 2E, is now on show at the Imperial War Museum Duxford. Following the Turkish invasion, the airport was the scene of some of the heaviest fighting between Cypriot and Turkish forces, which led the United Nations Security Council to declare it a United Nations Protected Area (UNPA) during the conflict. This required both sides to withdraw at least from the perimeter of the airport. With the ceasefire signed on 16 August 1974 Nicosia Airport became part of the United Nations controlled Buffer Zone separating the two communities on the island, and it has been inoperable as a fully functioning airport ever since. However, active United Nations helicopters are based at the site, which is used as the headquarters for the UN peace keeping mission in Cyprus UNFICYP and is used as one of the sites for