Aircraft images 9 1\/2
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What is Aircraft images 9 1\/2
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 an airfoil, or in a few cases the downward thrust from jet engines.
The human activity that surrounds aircraft is called aviation.
Crewed aircraft are flown by an onboard pilot, but unmanned aerial vehicles may 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.
Aircraft permit long distance, high speed travel and may be a more fuel efficient mode of transportation in some circumstances.
Aircraft have environmental and climate impacts beyond fuel efficiency considerations, however. They are also relatively noisy compared to other forms of travel and high altitude aircraft generate contrails, which experimental evidence suggests may alter weather patterns.