This article describes the air conditioning and control system of cabin which commertial aircrafts have adapted extensively upto now. Even though the aircrafts requires the study of the aerodynamics to produce the life in the air, most of internal system should utilize mechanical, electrical, and electronic system used on conventional appliances of industries. Therefore, all of industries are invited to pay more interest in this field aggressively and suggested to think the aircraft as a building simply moving in the sky.