In September 1996, Boeing launched the 4,000-mile-range 757-300, a stretched model of the 757-200 jetliner that seats from 243 to 279 passengers. The 757-300 measures 23 feet 4 inches (7.1 meters) longer than the 757-200. The extra length allows it to carry 20 percent more passengers than the 757-200 and increases the available cargo volume by nearly 50 percent. Because of its additional capacity, the 757-300 has about 10 percent lower seat-mile operating costs than the 757-200, which already has the lowest seat-mile operating cost in its market segment. The 757-300 and 757-200 share many of the same features. Both have high-bypass-ratio engines and a wing design that help make them two of the quietest, most fuel-efficient jetliners in the world. The wings on both the 757-300 and 757-200 are less swept and thicker through the center than those on earlier Boeing airplanes, permitting a longer span. The lower wing surface is slightly flatter, and the leading edge is somewhat sharper. This improves lift, reduces drag and makes for improved aerodynamic efficiency and low fuel consumption.