Several government agencies, including the U.S. Air Force Photo Library, the National Museum of the U.S. Air Force and the Smithsonian National Air and Space Museum, provide public-domain military aircraft photos from both World Wars. The Library of Congress offers a photo collection of military aircraft, parts and manufacturing plants.
Great Britain's Imperial War Museums offer more than 2000 images of British, German, French, Polish and American military aircraft from the first World War and more than 600 images from World War II. The images include air combat photos, aircraft blueprints and technical drawings. Most of the images are free to use for non-commercial purposes. Many of the images may be licensed for commercial projects or products for a fee.
The Air Force Historical Research Agency provides online access to special image collections, including photos of the earliest military test flights prior to World War I and aerial combat photos from World War II.
The World War II Database provides stock photos of more than 300 military aircraft, from 13 countries involved in the second World War. Users can search the database by country, aircraft classification or manufacturer. The majority of photos in the database are from government sources and are in the public domain.