The term aircraft covers a vast array of vehicles capable of flying or gliding through the air. Most broadly speaking, they have fixed- or rotary-wings, but may not include wings at all in the case of balloons and airships. Aircraft can also be manned or unmanned, powered or unpowered, and have a wide range of maximum altitudes they can operate to. They perform an enormous range of missions, from general, business and commercial passenger transportation, cargo, combat, media, emergency services, surveillance, agriculture and much more. Equally, aircraft vary greatly in shape and size. For example, at the top-end of the passenger-carrying aircraft world is the four-engined Airbus A380 which carries more than 650 passengers and crew thousands of miles, and at the bottom is the one-man foot-launched hang glider.