Its first flight was on 21 December 1988 under the Soviet Union and it is still in use today as a commercial cargo plane (Antonov Airlines). It was originally designed to carry the Buran space shuttle and its rocket boosters.
It takes 6 crew members to fly this plane. It also has a wingspan of over 290 feet.
The Antonov An-225 has 32 wheels supporting a maximum take-off weight of 640 tonnes that is about 1,411,000 pounds.
It can hold up to 300 000 kg of jet fuel; which is about 98,000 gallons of fuel.
There is only one AN-225 built, ever.
It has carried four military battle tanks (at once), wind turbine wings, parts of other planes, etc. Basically, anything too large for a normal cargo plane.
It is said to have cost over $300 million to make.