If humans could fly, I think some of us would. But it probably takes the same amount of energy as running. So realistically, I think most of us would end up like pigeons & loiter outside of convenience stores instead of flying across the country.
@roxiqt I wonder if the modifications to make us able to fly wouldn't also make it more likely for us to do so. You're going to have to amp up The metabolism and significantly decrease the body weight of a human to make it fly and support. Sentience. And it might be that we'd be more active if our bodies were always in high activity mode