- Aeronautics, Military (2)
- Periodicals (2)
- Aerial photography (1)
- Air mail service (1)
- Airports (1)
- Helicopter transportation (1)
- Helicopters, Home-built (1)
- Kellet XO-60 Autogiro (1)
- Kellet XO-61 Autogiro (1)
- Research aircraft (1)
- Rotorway RW 133 Scorpion Helicopter (1)
- Sikorsky (USA) R-4 (H-4) Family (1)
- Sikorsky (USA) R-6 (H-6) Family (1)
- Sikorsky (USA) VS-300 Family (1)
- Sikorsky (USA) XR-4 (1)
- Sikorsky (USA) XR-5 (1)
- Sikorsky (USA) XR-6 (1)
- Sikorsky (USA) XR-6A (1)
Our collections specialists actively work on the conservation, preservation, restoration, and long-term care of the objects in our collection. From full-scale restoration projects to applying preservation techniques and doing regular assessments, these activities form a crucial part of our stewardship of the National Collection.