Controlled Airspace
The area that requires permission for entry or exit from ATC. Any requests must be made towards ATC for any change to the direction of flight or current altitude. Any instructions issued by ATC must be followed as long as it is safe to do so and by following any instructions, will not break any laws. A pilot can deny a given instruction if he is unable to fulfil the request and may suggest another option that might work for ATC as well.