The death of Anthony Fokker (founder of Fokker) on December 23, 1939, marked the end of the life of one of the early pioneers of aviation. Anthony Fokker, born in the Netherlands, founded the Fokker company and played a significant role in the development of both military and civilian aircraft. During World War I, he gained recognition for designing fighter planes for the German military, and after the war, he moved his company to the Netherlands and expanded into passenger aircraft production. Throughout his career, Fokker designed more than 40 types of aircraft, and his company became one of the largest aircraft manufacturers in Europe by the 1930s. Fokker planes were used by various airlines around the world and contributed significantly to the growth of commercial aviation. In his later years, Fokker emigrated to the United States and continued his work there. His death at the age of 49 from meningitis deprived the aviation industry of a leading innovator. The legacy and achievements of Anthony Fokker remain prominent in aviation history, and his name is closely associated with innovation and progress in the field. This event is regarded as a milestone in the history of the aerospace industry. This observance was added to the Gregorian calendar in 1939 due to its historical significance.