United States Air Mail Service. A special mailbox with writing "Air Mail Only, Special Air Plane Postage" written on it, with various prices in cents also listed. Mailbox is located in an urban city area. Tag at base of box says "City Hall station." Next scene shows planes in front of a hangar. "US Air Mail Service" sign atop hangar door. An early model 1920s truck arrives in the foreground. Men load mail in the forward cockpit of mail plane. Biplane aircraft in flight to deliver mail.
United States Army Air Service aircraft. Wing structure of a U.S. aircraft in the foreground. Snow covered volcanoes in the background. Smoke rises up from the volcanoes. Crater of the volcano in view. U.S. Army Air Service aircraft DH-4 in flight over the Great Canyon. Seaplanes taxi into water. Planes in formation.
United States battle ships in a column. Aircraft zooms low alongside battleship. Bow of a battleship underway. Planes fly over battleship fleet. Smoke screen laid by the aircraft.
United States Navy battle ship underway. Aircraft zooms low alongside battleship. Planes fly over the battleship fleet. Sailors aboard a battleship. Smoke screen laid by the aircraft. Ground crew at the flight deck of the ship. United States Aircraft catapulted from the battleship.
Research and field tests during Project SOIAS (Sliding On Ice and Snow). Navies plane in snow. Engineer picks up different type of skis and turns them over. Meter in the cockpit. Men push the plane in circle showing all three skis. Plane taxis. C-125 equipped with skis. Equipment used for forecasting weather. Meter records snow conditions. Navies test vehicles make comparison of records made from test flights. Plane takes off. Another Navies test vehicle. Ski shows chemical liquid coming out of holes. Tests on drag recorded. Freeze tests on wheels. Attempts to start aircraft. Mechanics work on aircraft. Interior of the cockpit. C-125 takes off.
Research and field tests during Project SOIAS (Sliding On Ice and Snow). C-125 in flight over terrain, small lakes, Lake of the Woods in Kenora, Canada. Ski equipped C-125 lands. Ski equipped Navion plane lands and taxis. C-125 taxis over Kenora Air base. DeHavilland Beaver taxis. Canadian Fox Moth aircraft taxis. Stationary Canadian Norsemen. Ski attached to aircraft. Shock absorber attached to the ski. C-125 stationary. Two Navion planes face each other. Mechanics work on Navion plane. Mechanics work on landing gear of Ski equipped C-125. Oscillograph instrumentation system used to record load records. Aircraft engineer work on equipment.
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