What is the definition of an aircraft?

The definition of an aircraft is best captured by stating that it is a device that is used or intended to be used for flight in the air. This encompasses a wide range of flying vehicles, including airplanes, helicopters, drones, and other types of airborne vehicles. The core characteristic that distinguishes an aircraft is its ability to achieve flight, whether that be through the use of fixed wings, rotors, or other lifting surfaces.

Other options do not align with this definition. A vehicle designed specifically for ground transportation does not have the capability to fly and, therefore, does not meet the criteria of being an aircraft. Similarly, a structure for storing aviation tools or a model used for training pilots also fall outside the definition of an aircraft, as they are not designed for actual flight performance. Understanding the fundamental characteristics that define aircraft is essential for anyone involved in aviation or studying related fields.