Here is the An-225, which is the world's largest aircraft. It was designed to carry the Russian Space Shuttle, The Buran, which now sits in Gorsky Park in Moscow. There are only two in existance and it's little brother, the An-124 is widely used as a cargo plane that carries things others can't. Now, I am not sure if the C-5 is bigger, or, isn't for lease, but when it comes to heavy lifting, the AN-124 usually get's the call. The AN-225 just came out of moth-balls, but me thinks it has become too expensive to become useful ... in my limited knowledge of the subject . . .
