The 777 is the widest, most spacious airplane in its class and includes improvements in airfoil technology, flight deck design, passenger comfort and interior flexibility. Its greater payload and range capability result in lower operating costs to airlines, and its standard equipment includes many features that are optional on other airliners. The airplane is larger than all other twinjet or trijet airplanes but smaller than the 747. It brings the twin-engine economic advantage to medium- and long-range markets. The 777 currently is available in five models: 777-200, 777-200ER (extended range), 777-200LR (longer-range), 777-300 and the 777-300ER.