Access to the cargo holds is through doors in the belly of the aircraft. There is no access from the cabin area. Like the fuselage to which they are attached, they are made of aluminum panels riveted together. The point of attachment is the aircraft's center of gravity, or balance point. Swept wings produce less lift than perpendicular wings, but they are more efficient at the high speeds that a jet will travel at because they create less drag.
Wings are mostly hollow inside, with large compartments for fuel.
On most of the aircraft in service today, the wings also support the engines, which are attached to pylons hung beneath the wings. Wings are designed and constructed with meticulous attention to shape, contour, length, width, and depth, and they are fitted with many different kinds of control surfaces. Empennage The empennage is the tail assembly of an aircraft, consisting of large fins that rise both vertically and horizontally from the rear of the fuselage. Their primary purpose is to help stabilize the aircraft, much like the keel of a boat. In addition, they also have control surfaces built into them that help the pilots steer the aircraft.