TABSO Flight 101 was a scheduled service of the Bulgarian national airline from Sofia, Bulgaria, via Budapest, Hungary, and Prague, Czechoslovakia, to Berlin Schönefeld Airport in East Germany. The service was operated by the airline's 1960s' flagship equipment, the Ilyushin Il-18B airliner. On Thursday 24 November 1966, due to bad weather the aircraft was diverted to Bratislava airport, but when the flight resumed, the aircraft crashed into the surrounding hills shortly after takeoff, with the loss of 82 lives. The crash site is within modern-day Slovakia, and is considered that country's deadliest aviation disaster.