An aircraft is a machine that is able tae flee bi gainin support frae the air, or, in general, the atmosphere o a planet. It coonters the force o gravity bi uisin aither static lift or bi uisin the dynamic lift o an airfoil, or in a few cases the dounward thrust frae jet ingines.
The human activity that surroonds aircraft is cried aviation. Crewed aircraft are flewn bi an onboard pilot, but unmanned aerial vehicles mey be remotely controlled or self-controlled bi onboard computers. Aircraft mey be clessifee'd bi different criteria, sic as lift type, propulsion, uisage an ithers.