9 January 1945 (Philippines): US Army Air Forces participate in opening of Luzon, Philippines Campaign.

9 January 1923 (Spain): The first flight of a practical gyroplane or rotorcraft is made by Juan de la Cierva’s C-3 Autogiro, which is flown by Spenser Gomes in Madrid, Spain.

9 January 1793 (USA): Frenchman Jean-Pierre Blanchard in Philadelphia makes the first manned free balloon ascent in America in a hydrogen balloon.