110 years ago today, December 12, 1915 (November 6, 1915 in the lunar calendar), the first metal aircraft was tested for the first time. Junkers designed the world's first all-metal aircraft in 1915. Junkers is a famous German aircraft designer and aviation industry entrepreneur. On February 3, 1895, he was born in Wright, Germany. In 1908, Junkers began working on aircraft development. In 1913, he built Germany's first wind tunnel in Aachen. Junkers made important contributions to the development of all-metal aircraft. On December 12, 1915, the J-1 aircraft he designed was tested for the first time. It was the world's earliest all-metal aircraft. After the end of World War I, he opened his own aircraft factory, mainly engaged in the development and production of transport aircraft. In 1919, the world's first all-metal passenger aircraft, the F-13, he designed, successfully flew. It can carry 4 passengers and fly at a speed of 136 kilometers per hour. This passenger plane was the most advanced aircraft in Europe at the time. Through the large-scale export of F-13, the Germans laid the material and technical foundation for the development of their aviation industry. In 1932, the company successfully developed and mass-produced Ju-52 large transport aircraft, producing a total of 4000 aircraft, which are widely used around the world. During the blitz of Norway in World War II, the Ju-52 transport aircraft continuously transported troops and supplies in the air, making great contributions to the occupation of Norway, and was affectionately called "Aunt Rong" by German soldiers. Junks died on February 3, 1935 in Gaoting, near Munich. Since then, Junkers has successfully developed the Ju-87 and Ju-88 bombers. They are the most famous military aircraft in Germany's air strikes against allies and have always been the main German aircraft during World War II. Comment: The first metal aircraft is tested for the first time!