The best (logical) way to do in a fell beast would be some form of ranged weapon. Of course, lacking lasers or other such weapontry that could easily make things go in a completely differing direction, the logical idea would be as previously mentioned either arrows or a catapult.
One can assume that the Nazgul and fell beasts were smart enough to stay out of range of these.
I would recommand finding either some other way to fly, or getting Gandalf to summon up a windstorm of some sort. If he could. Getting a fell beast caught in a tornado might help get them out of midair. If not, air to air attacks (unfortunately the Gondorians lack x-wings) or the good ol' beheading might work. Not as showy as most movies require, but effective.
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