Which term is used to refer to a device intended for flight in the air?

The term "aircraft" specifically refers to any device that is designed for air travel. This encompasses a wide variety of vehicles, including airplanes, helicopters, and gliders, all of which are engineered to operate in the atmosphere. The significance of this term lies in its broad applicability to all forms of flying machines, whether for commercial, military, or recreational purposes.

In contrast, while "vehicle" is a general term for any mode of transportation and could potentially refer to an aircraft, it does not specify that the device is intended for flight, thus making it less accurate in this particular context. "Flying Object" is a more vague expression and doesn’t convey the designed functionality for flight, while "drone" refers to a specific type of unmanned aircraft. Therefore, aircraft is the precise and inclusive term that captures the essence of a device meant for flight.