Today, 46 years ago, on November 20, 1979 (October 1, 1979 in the calendar), the Shaanxi-Lassa route was operated. On November 20, 1979, the Shaanxi-Lhasa flight was officially operated. More than seventy passengers on the first flight flew for more than five hours, at an altitude of five thousand to eight kilometers, over the magnificent six mountains, the mirror-shaped Qinghai lake, the endless Cheddar basin and the snow-white Tongola mountain, etc., for more than two thousand and three hundred kilometers. The opening of the Shaanxi-Lhasa route allowed people to fly to Tibet from the north-east, north-east and eastern China, south-south and north-west parts of the country, taking two days less