what makes a kite fly
The necessary lift that sustains the kite in flight is generated when air flows above the kite's surface, producing low pressure above and high pressure below the wings. The interaction with the wind also generates horizontal drag along the direction of the wind.
Kites with large surface area or powerful lift can lift the people who fly the kite off the ground or drag them into other objects. In urban areas there is usually a ceiling on how high a kite can be flown, to prevent the kite and line infringing on the airspace of helicopters and light aircraft.