Originally Posted by
XinuX
Imagine that you are on the zeppelin.
You then mount your flying mount, and start flying in the direction the zeppelin is flying, still being on the zeppelin.
You are now moving in the speed of the zeppelin PLUS your own mounted speed.
If you fly away from the zeppelin, it is intended that you stop moving with the zeppelin.
However, if you keep flying in the path ahead that the zeppelin takes, you will not 'leave' the zeppelin, and you will keep the speed until you leave the path.
If you still don't understand I'd recommend trying it yourself.