From The Collaborative International Dictionary of English v.0.48 :
Aircraft \Air"craft`\, n. sing. & pl.
Any vehicle, such as an airplane, helicopter, balloon, etc.,
for floating in, or flying through, the air.
[Webster 1913 Suppl. +PJC] aircraftman
From WordNet (r) 3.0 (2006) :
aircraft
n 1: a vehicle that can fly