From WordNet (r) 2.0 (August 2003) [wn]:
aircraft
n : a vehicle that can fly
From The Collaborative International Dictionary of English v.0.48 [gcide]:
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