Where do you fly in World of Warcraft with expert riding?
There are many ways of achieving the levitation effect (potions,
spells, etc.), but you can also achieve it by cheating. Use the
console. If you're on a computer,
Press [~] (under [Esc]) and then type TCL and press enter.
If you don't want to cheat, you can enchant a piece of clothing
with levitate (or the ability to breathe underwater), and put it on
when you want to fly. When I played through, I enchanted one shirt
to make me levitate, and one that would let me breathe underwater,
so I could explore underwater ships and also get into places that
were impossible without flying.