flies 300 meters

Accelerator was already floating a few meters up.
Convinced that he had done the right thing, Accelerator flapped his white wings. His
one-hundred-meter wings used more than just the power of the wind. They also
converted some more unknown energy into lift. He emitted no force down at the earth,
but he still shot up like a bullet.
In an instant, Accelerator reached a point three thousand meters up and scattered the
thick clouds that were hanging in the sky.

- Toaru Majutsu no Index Volume 22, Chapter 12 Part 1