Not the largest aircraft ever... those are all "airships." And why? To move 100m wind turbine blades. And why? Because the reason on-shore wind has a poorer ROI is because those projects are limited to 70m blades whereas off-shore projects use 100m blades.
The idea is to allow off-shore tech to be built on-shore
https://www.bbc.com/future/article/20250729-windrunner-the-company-that-wants-to-build-the-worlds-largest-aircraft?