[ Autographs ] IGOR SIKORSKY A.L.S. signed at conclusion and in text,2pp. 4to., Pass Christian, Ms., Sep. 3, 1960 to his secretary settingforth his detailed travel plans for Colorado Springs, also requesting she forward: "...the name and address of the officer attached to the Air [Force] Academy in Colorado Springs..." With holograph transmittalenvelope with signature in return address and in address to his company. Two pieces.