Aerospace is the human effort in science, engineering and business to fly in the atmosphere of Earth (aeronautics) and surrounding space (astronautics).
An aircraft is a machine that is able to fly by gaining support from the air.
A Certificate of Airworthiness is a permit for operation, issued for an aircraft by the national aviation authority in the state/nation in which the aircraft is registered.
Flight is the process by which an object moves through an atmosphere (or beyond it, as in the case of spaceflight) without contact with the surface.
Homebuilt aircraft, also known as amateur-built aircraft or kit planes, are constructed by persons for whom this is not a professional activity.
This is a list of experimental aircraft, or aircraft used or built to conduct experiments involving aerodynamics, structural materials, propulsion systems, configuration and equipment.
The X-planes are a series of experimental United States aircraft and rockets, used to test and evaluate new technologies and aerodynamic concepts.
The United States of America (USA), commonly known as the United States (U.S.) or America, is a federal republic composed of 50 states, a federal district, five major self-governing territories, and various possessions.