Antonov An-225 Mriya

One An-225 was completed in 1988 and a second An-225 has been partially completed. The one An-225 is in commercial operation carrying oversized payloads.
Development
The Antonov An-225 was designed to airlift the Energia rocket's boosters and the Buran space shuttle for the Soviet space program. It was developed as a replacement for the Myasishchev VM-T. The An-225's original mission and objectives are almost identical to that of the United States' Shuttle Carrier Aircraft.