A two-channel plane is a wide-body passenger plane with a body width greater than 3.6M The seats in the cabin are divided into three areas: left, middle and right (only left and right for a single channel), and the two-channel plane has two aisles. Typical wide-body passenger aircraft such as B747B777 are developed on the basis of the first generation of jet passenger aircraft, which is a great leap in aviation technology. There are 11 kinds of wide-body passenger aircraft in the world, with a total output of more than 2,000. Among these wide-body passenger planes, Boeing 747 is a well-deserved protagonist.