Aircraft refers to any machine that can derive support in the atmosphere from the reactions of the air other than the reactions of the air against the earth's surface.
Common types of aircraft include:
1. Fixed-wing aircraft (airplanes)
2. Rotary-wing aircraft (helicopters)
3. Gliders
4. Airships
5. Drones (unmanned aerial vehicles)
The term "aircraft" is both singular and plural in English usage.