I don't really hold with the them and us debate but believe that the ability to fly is due to willpower at all levels.
the development of aircraft of all kinds has only come about by the willpower of a few people who saw the possibilities and refused to give up untill they had made them a reality.
Today those of us who fly have used the same willpower to raise ourselves up to the level of experience and acheivment that we dreamed of as kids. If at any point that will is overcome the goal will not be acheived.
To many the goal of vertical liftoff and landing seemed impossible and there were many failures which had to be overcome before the final success. Likewise flyers strive to overcome the groundfastness which is our natural state, and become at home in the air, ascending and returning at will.