Aircraft

Motorized aircraft

Airplanes, fixed or rotary wing

Helicopters

Nonmotorized and lighter-than-air aircraft

Airships

Balloons, hot air (aircraft)

Blimps

Dirigibles

Gliders (aircraft)

Hang gliders

Autogiros

Research and development on aircraft by the manufacturer

Aircraft engines and engine parts

Air scoops, aircraft

Airfoils, aircraft engine

Cooling systems, aircraft engine

Engine heaters, aircraft

Engine mount parts, aircraft

Exhaust systems, aircraft