1. Airbus Beluga
The Airbus Beluga (Super Transporter) is a version of the standard Airbus A300 wide-body airliner, modified to carry aircraft parts and over-sized or awkward cargo. It was officially called the Super Transporter at first, but the name Beluga became popular and has now been adopted as official.
The Antonov An-225 is a strategic airlift transport aircraft which was built by Antonov, and is the world's largest powered aircraft.
It measures 84 meters in length (11 more than the A380) and his lifting capacity is of 250 tons. Antonov are used for the transport of very heavy loads , as train wagons...
and even Skycranes!
The Shuttle Carrier Aircraft (SCA) are two extensively modified Boeing 747 jetliners that NASA uses to transport a space shuttle orbiter.