[Underwhelp]

You can get it to fly feardragonx, you need to edit your mesh yourself currently, open up the mesh editor, Show triangles and Nav mesh, then create a new OMC - Under connections -> Add OffmeshConnection "Portal" onto the navmesh, set it to near that area you wish to start flying, then fly to fishing spot and select it again for the end point. Save your Navmesh of the area.

It should then Mount a flying mount , this must be selected correctly, move to the start of the OMC, then fly to the other end of the connection and start fishing.