Has anyone ever flown a plane and fought it?

[awdsawds 3]

I'm in the air and I want to move the sight to the target on the ground.

But how ?

The mouse cannot move the sight.

There is a crosshair on the screen, but I don't know which button to move it with.

 

That's probably why no one has ever played it in multiplayer.

And we are play only War thunder.