An aircraft is a vehicle which is able to fly through the Earth's atmosphere or through any other atmosphere. Most rocket vehicles are not aircraft because they are not supported ...
http://en.wikipedia.org/wiki/Aircraft

The Federal Aviation Administration is responsible for the safety of civil aviation ... U.S. Department of Transportation Federal Aviation Administration 800 Independence Avenue ...
http://www.faa.gov/aircraft/

A fixed-wing aircraft is a heavier-than-air craft whose lift is generated not by wing motion relative to the aircraft, but by forward motion through the air.
http://en.wikipedia.org/wiki/Fixed-wing_aircraft

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http://dictionary.reference.com/search?q=Aircraft&r=66

Manufacturers of a wide range of propeller-driven aircraft for business and personal flying.
http://www.newpiper.com/