#flying machine
- Aircraft — Any technical apparatus capable of sustaining itself in the atmosphere and moving through airspace due to the reactions of the air, other than its reactions against the earth's surface. This vast category structurally includes both aircraft lighter than air, such as balloons and airships, and aircraft heavier than air, such as airplanes, helicopters, and gliders.
- Aerial vehicle — Any vehicle, complex technical apparatus, or aircraft structurally designed to navigate, sustain itself, and perform transport operations within Earth's atmosphere. This vast category encompasses both lighter-than-air craft (balloons, airships) and heavier-than-air craft (planes, helicopters, drones, air-cushion vehicles).