I might even go so far as to define it as such.

It flies through the air in a way that bricks don't.

It holds 380 vs 747, duh

Short route, japanese spec 747s could seat 624. Similarly specified A380 would probably seat well over 1000.

I've flown on it as well, and the quietness is really remarkable.

While all other passenger planes are smaller than the A380, it's also far quieter than other very large passenger planes like the 747 and 777. Other modern designs making significant use of composites like the A350 and 787 are also not nearly so quiet.

Taller, too. The A380 has an upper passenger deck for the full length of the aircraft, not just the 747’s hump up front. The length was constrained by existing airport gates. If it was longer, it would have hung out into the taxiways. (The wider wingspan and wheel base are still an issues, though.)

Since no one actually answered your question: basically yes, you can just scale airplanes linearely up and down. Obviously everything has to scale, like propultion and hydrolics power, but you can esentially make a model aircraft the exact same shape as any large aircraft and it will fly. Conversly, you can test a small model in a wind tunnel and then scale it up as much as you want and it behaves mostly the same way.

Nothing in the world really works at infinite scale because the size of atoms doesn’t change. In order for something to scale infinitely it also needs the environment in which it’s found to scale along with it.

Fun fact, the reason bees can fly is because, at their scale, the air is so thick that they’re actually doing something closer to swimming through it. A plane 6x as big would be, conversely, flying through incredibly thin air from its perspective.

Look at the size difference between the engines.

The A380's are enormous.

It was just in the pool