According to Wikipedia: "The Antonov An-124 Ruslan (NATO reporting name: Condor) is a strategic airlift jet aircraft. It was designed by the Antonov design bureau in the Ukrainian SSR, then part of the Soviet Union. The An-124 is the world's highest gross weight production cargo aeroplane and second heaviest operating cargo aircraft, behind the one-off Antonov An-225 (a greatly enlarged design based on the An-124)."