An aircraft is a machine that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the dynamic lift of anairfoil,[1]or in a few cases the downward thrust from jet engines.The human activity that surrounds aircraft is calledaviation.Crewedaircraft are flown by an onboardpilot, butunmanned aerial vehiclesmay be remotely controlled or self-controlled by onboard computers. Aircraft may be classified by different criteria, such as lift type,aircraft propulsion, usage and others.
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