Photographer: Keystone View Co. Airplanes - Types Public domain photograph related to the United States in World War One, free to use, no copyright restrictions image - Picryl description
Photographer: Signal Corps - U.S.A. Airplanes - Types Public domain photograph of a bomber aircraft, free to use, no copyright restrictions image - Picryl description
Photographer: Underwood & Underwood Airplanes - Flight Public domain photograph related to the history of France, free to use, no copyright restrictions image - Picryl description