30 April 1914

A single-seat monoplane designed by Roumanian George Gramaticescu flew for 26 min 30 sec on the April 30, 1914. It featured an unusual airfoil for which Gramaticescu had obtained a Swiss patent. Gramaticescu didn't live to see his creation fly, as he died in France in 1913, but a group of French engineers and pilots finished the plane according to his sketches. There were plans for improving the airplane and mass-production but after the outbreak of World War I the project was abandoned.