The fight takes place in a 1 mile x 1 mile x 1 mile indestructible box with an unlimited amount of oxygen. All characters are bloodlusted. They begin in the middle of the box twenty feet apart. The team knows each other's abilities, but nothing about Superman. Superman knows nothing about them. Nobody gets any prep time.
Superman is at the point where he has fully realized his basic powers and is well practiced in them. This is not Silver Age Superman.
Flash is the JLU cartoon version.
Bane is as powerful as he can get.
Cyclops is as powerful as he can get.
Aang is as powerful as he is at the end of Sozin's Comet, however, he can only airbend. He can enter the avatar state.