The Boeing 767 is a mid-to-large size, wide-body, twin-engine jet airliner manufactured by Boeing Commercial Airplanes. The 767 first entered service in 1982 with United Airlines and is one of the most widely used of the Boeing commercial jetliners. The 767 is typically used on routes which are too long for the smaller 757, but not as long as larger airliners such as the 747 or 777. The 767 is powered by two Rolls-Royce or GE engines, giving it a range of up to 5,000 nautical miles (9,260 km). The plane has been fitted with both extended range cargo and passenger variants. Its fuselage is about 14.4 meters (48 feet) wide, allowing for a maximum of 240 seats in a two-class configuration, or 375 seats in a single-class arrangement. Its cabin is split into two decks, with the lower deck carrying most of the cargo and the upper passenger cabin. The airplane has a maximum take-off weight of up to 225,695 kg (497,930 lbs), depending on the variant. Its maximum cruise speed is Mach 0.78 - about 817 kilometers per hour (511 mph). The 767 is an iconic plane, with its curved windshield, chunky underbody and distinctive twin-engine mounted underneath the tail. It has been a very successful plane for Boeing, being used by various airlines around the world, including United Airlines, Air Canada, American Airlines, Delta Airlines, Air France, British Airways, Southwest Airlines and many more.