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1.
Any device that flies. An airplane is an example of an aircraft, as are helicopters, dirigibles, gliders and balloons.

Every aircraft needs an aviator or pilot to fly it.
"That Cessna is one fine looking hunk of aircraft!"
by Athene Airheart March 20, 2004
 
2.
Someone's nose, usually a large or ungainly one.
"God, look at the size of his aircraft! He'll have someone's eye out!"
by Nat M. May 24, 2006