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Photograph of a Douglas C-1 aircraft (fuselage number 1) aerially refueling the "Question Mark," a U.S. Army Air Service Fokker C-2A aircraft, circa 1929.

Photograph of an aerial refueling procedure between a Douglas C-1 aircraft and the "Question Mark," a U.S. Army Air Service Fokker C-2A aircraft, circa 1929.

Photograph of a Douglas C-1 aircraft (fuselage number 1) aerially refueling the "Question Mark," a U.S. Army Air Service Fokker C-2A aircraft, circa 1929.

Photograph of a Piaggio P.50-II aircraft, circa 1939. Stamped on verso: "Piaggio & C. Soc. An. -- Genova / Stablilmento di Finale Ligure / Apparecchio Tipo P.50 IIA.S. / [crossed out: 'Dis.'] N. 24 / Peso Kg. [blank] / Data -- 1 Apr 1939 / Neg.…

Photograph of a Northrop A-17A aircraft, circa 1937. An emblem depicting the U.S. Capitol Building is painted on the fuselage.

Photograph of a U.S. Army Air Service Northrop A-17A aircraft, circa 1937.

Photograph of three men with an unidentified aircraft, circa 1920s-1930s.

Photograph of two men with a Northrop Gamma 2A "Sky Chief" aircraft, circa 1932. The engine cowling is removed.

Photograph of a Northrop XA-16 aircraft, circa 1930s.

Photograph of a Northrop A-17 aircraft, circa 1935.