Man-made flying objects are divided into two general categories: 1- Aircraft: Atmospheric flying objects (atmosphere). 2- Spacecraft: Non-atmospheric flying objects. An aircraft or aircraft is any device that can fly in the atmosphere. By this definition, a variety of flying objects such as balloons, windmills and helicopters can be called airborne. An aircraft is a machine that can fly with the help of air. This machine uses the static or dynamic force of a coyote to overcome the force of gravity; And in rare cases, the power of jet engines is used.