From Russia with Love

What is the largest aircraft ever flown?  It's the Russian Antonov An-225 "Mriya", or in English, the "Dream".

 Designed for the Russian space program, the An-225 is a MASSIVE metal monster.  While 2 were set for production, only one craft was ever completed in 1988.  The An-225 has carried the Russian shuttle, and most recently was used to transport relief aid to Haiti.