Approximately two thirds of the materials in this subseries are photographs of aircraft, primarily of U.S., French, and German manufacture, 1899-1956; the remaining third consists of postcards published circa 1930 of historic aircraft and models in the Science Museum, London. The earliest photographs, dated October 1899, are of the engine built by Stephen M. Balzer for Samuel P. Langley's unsuccessful airplane. The bulk of the photographs relate to aircraft of U.S. manufacture, in particular those built by Consolidated Aircraft (from 1943, Consolidated Vultee, popularly known as Convair), San Diego, CA, between 1923 and 1956. The photographs include pages from a comb-bound publication picturing aircraft built by the company between 1923 and 1945; two large-scale photographs of the PBY-5 flying off the Southern California coast, signed by Otto Menge, official photographer of the company; a large-scale photograph of the XP-81 mixed-engine fighter flying over the Southern California desert; photographs of the XC-99 transport under construction, circa 1947; photographs of the first official view of the XB-46, January 1947; and five photographs of the XF2Y Sea Dart jet fighter, 1956. Other aircraft of U.S. manufacture include the Solar Aircraft Co. Solar MS-1, 1930; the Goodyear rigid airship USS Akron, 1931, and the airships Columbia and Mayflower; the Granville Brothers Gee Bee Super Sportster, R1/R2 Longtail, 1933; and a small number of military aircraft built by Lockheed, circa 1945. Aircraft of French manufacture include the Breguet 763, 1951; and the S.N.C.A.S.O. SO-1221 Djinn helicopter, SO-6021 Espadron, and SO-4050 Vautour and SO-9000 Trident jet fighters. Aircraft of German manufacture include the Dornier Do X flying boat, 1930 (a series of postcards, several signed by Capt. Friedrich Christiansen and Harvey Brewton, the Curtiss representative), and the Zeppelin airship LZ127 "Graf Zeppelin". Materials relating to the latter include a photograph of a certificate signed by the passengers on the first voyage of the LZ127 to South America, May 1930, and a souvenir "Bord-Album,", containing photographs of the crew for the voyage, the passenger accommodations on board the airship, and sights of interest along the route. Among the models of historic aircraft in the Science Museum, London, pictured in the postcards are Henson and Stringfellow's flying machine, built in 1844-45, from Henson's 1842 design; Stringfellow's 1848 model airplane; Sir Hiram Maxim's 1894 flying machine; Josée Weiss's 1905 glider; biplanes, 1908-1921, by Voisin, Farman, Avro, Bristol, De Havilland, Fairey, Handley Page, and Vickers-Vimy; the British airship R 34; the "Moth" light airplane; and the Supermarine-Napier Seaplane S.5. Original aircraft pictured in the postcards include the Vickers-Vimy Rolls-Royce twin-engine biplane in which Alcock and Brown made the first direct trans-Atlantic flight in 1919, and the Supermarine Rollys-Royce Seaplane S.6 that won the Schneider Trophy Contest for Great Britain in September 1929.