1964. In 1957, the original grass runway 16/34 was re-laid in concrete. In 1964, the former runway 16/34 was abandoned for a newer runway 02/20. The new runway was extended from with the joint effort of the Asian Development Bank (ADB) and the OPEC in 1975. The runway was re-strengthened in 1981. In 1961, Queen Elizabeth II landed in a Dakota plane for her first visit to Nepal, one of the most high-profile arrivals at the airport. In 1967, Tribhuvan International Airport witnessed its first jet aircraft, a Lufthansa Boeing 707 and 1972, the Nepali flag carrier, Royal Nepal Airlines commenced jet operations from the airport with a Boeing 727. The same year, Nepali personnel took over air traffic services from the Indian personnel. In 1985, the extension apron of the runway 02/20 was overlaid. Similarly, the development of the terminal building was commenced in the same year. In 1987, the construction of the Airlines Operation and Control Tower building was completed and the taxiway was overlaid. In the same year, on 11 October, Nepal witnessed the first ever landing of Concorde. In 1989, the construction of the terminal building was completed and on 18 February 1990, the newly built TIA complex were officially inaugurated by King Birendra Bir Bikram Shah. In 1992, Necon Air, Nepal's first private airline commenced the domestic operations from TIA with Hawker Siddeley HS 748. In 1995, works started to expand the domestic terminal. Likewise, Amplitude modulation signalling system (AMSS) and very-small-aperture terminal (V-SAT) were also installed at the airport. In 1997, airport surveillance radar (ASR) and secondary surveillance radar (SSR) came into the operation. The installation of radar surveillance was proposed by Japan in 1994, following the crash of Thai Airways Flight 311 and Pakistan International Airlines Flight 268 in 1992, which claimed the lives of 280 people altogether; including the 17 high-level Japanese diplomats. On 9 September 1998, Prime Minister Girija Prasad Koirala officially inaugurated the radars. In May 2007, Austrian Airlines discontinued its flight to Vienna, Nepal's last direct air link to Europe. In September 2013, Turkish Airlines launched direct flights from Istanbul to Kathmandu, re-establishing Nepal's connection with continental Europe. In August 2013, the airport's only runway had to be closed for wide-body aircraft because the runway, which was in disrepair, could no longer withstand their weight. In 2016, a new domestic terminal of 6300 m2 (67,813 sq. ft.) was opened,