Flight is the ability to resist the pull of a planet's gravity and navigate through either outer space or a planetary atmosphere. Some characters possess this ability naturally, either as a function of their race, or because of some genetic abnormality, such as in the case of Metahumans. Other characters require external sources in order to fly. Members of the Green Lantern Corps for example, can fly through the use of their Green Lantern Power Rings. Likewise, Members of the Legion of Super Heroes can fly through the use of their Legion Flight Rings. Some characters, such as Thanagarians, can fly by way of anti-gravity Nth Metal wing harnesses.