Fly speed vs ground speed

Hi hopeing il find some pro´s here to answer on this .

So ground speed is effected by all poitons and boosts and gear .

But what about fly speed how much can we get flying , raven ,duck, bat.

I can see as a bat some skills effect fly speed but not all im bit confused what does if someone has tested this

a max speed he has reaced flying please share in formula .

Thanks.