Edit: I hope the good number of views but nonexistent number of replies is not an indication that nobody cares, but that I didn't give much material to talk about. So here's some:
I don't know how I know what flying feels like, but I know that I know. When I think about it, it's sometimes so vivid that I can't believe I'm fabricating it entirely. What's more, is the very few times when I was young when I naturally dreamed about flying, it was wonderful; but on those couple of occasions that I've lucid-dreamed and had the presence of mind to remember my agenda and forced myself to fly, it was not very good at all. Even weirder, I can not only imagine what the air rushing across my wings would feel like, but I can imagine myself touching them, and not only do I feel the texture of the feathers in my hand, I can feel the touch of my hand on my wing. From a purely neurological point of view, I know what the details of nerve input would be from nerves I don't have! And it's as realistic as imagining touching my arm, and to me it's clear I'm not just imagining my arm as the wing.
Or how about this:
If the human race hasn't killed itself with global warming or nuclear weapons or whatever else we come up with first, it is likely that someday a person will be genetically engineered to have wings and all the other bodily modifications necessary for flight. This probably wouldn't be the first thing the genetic engineers would try, as I suspect it would be rather complicated. But I think they would probably by that time have figured out how to keep the genes that control our "humanity", our brain and stuff (if that's even how we work), and change the rest almost at will. Anyway, when that day comes we will have to decide: should we make everyone winged? Should we take the genetic future of our species out of the hands of nature in such a big way? In one way, we've already bulldozed Nature's Way for our own purposes in many ways, why should this be any different. On the other hand, it'll be hard for the first few generations to adjust to a world that had been made by earthbound humans. And most importantly, can we keep our humanity if we are so different?
Or maybe a little B-grade fantasy to set the mood?
They climbed to the summit of the mountain. Its tall white cliffs overlooked the sea. Jake looked at Sarah and their eyes met. Together they ran toward the edge, spread their wings, and took the leap. The wind caught their wings and they were lifted on an updraft, soaring. Jake had loved flying, the few times he got to, but this was above and beyond. He seemed to intuitively make the right adjustments to his wings and body to stay aloft easily. They passed over the forest, the meadow, the shore, the sea. The world lay out below them. It seemed perfect for their wishes. The afternoon sun reflected gorgeous patterns off the gently rippling water. Jake took in the feel of the wind rushing across his body, the exhilarating lift, the beautiful landscape below, the limitless sky above...