What is the longest an heaviest aircraft ever built?
Antonov An-225 Mriya
Antonov An-124 Ruslan
The Antonov An-225 Mriya is a strategic airlift cargo aircraft that was designed by the Antonov Design Bureau in the the Soviet Union during the 80's. It is powered by six turbofan engines and is the longest and heaviest aircraft ever built, with a maximum takeoff weight of 640 tonnes.