The An-225 is (by some measures) the largest aircraft to fly and was one of the last major projects of the Soviet Union.
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The Largest Plane in the World RIP

The Antonov 225, once the largest aircraft in the world, the heaviest aircraft ever built and with the largest wingspan, now ...
An Antonov An-124 came to Midland to load AST SpaceMobile’s BlueBird 6 and 7 bound for Cape Canaveral for a NASA launch, drawing crowds.
Hyderabad airport demonstrates its capability to handle one of the world’s largest cargo aircraft, reinforcing its global ...