The definitely largest airplane ever built is the Antonov An-225 Mriya, designed by the Soviet Union all the way back to the 1980's. Only one of these guys exist today, and believe it or not: The agreement for building a second one was made in 2016. Not bad making the second one of these so many years after the original design was ready.
Anyways, this airplane is not for you and me. This is a cargo plane that can take off with a insane weight of no more than 640 tons. Dude. That's like 5.805.972 bananas with an average weight of 100 grams. Not bad. Is it just me, or did that amount of bananas on an airplane not sound impressive at all?
Check out the movie to learn a little bit more about the 10 largest airplanes ever built.