well,
why do you have enter a plane or a helicopter to fly?
It's simply not possible.
This is a 10 year old game. to archieve graphics similar in quality to Oblivions you have to do many tweaks, that go really in depth, like (as far as I comprehended) DirectX settings, that are the base to the whole rendering process. The Morrowind.exe gets decompiled to optimize it and so on. these are changes, that are usually to be made by professionals. Morrowind Overhaul makes it possible for almost any user who can spare half of a day to carefully read and follow the installation instruction to heavily change the looks of Morrowind.
And if youre having trouble with the installations you can get quick help in the forums...