is superman's flight a feat of strength
Because Earth and the Sun exhibits less gravitational pull than that of Krypton, and also due to his solar-powered body, the Man of Steel can also alter his personal mono-directional gravity field to propel himself through the air at will. Originally, he only had the power to jump great distances, as stated by the 1940s Superman cartoons slogan ``Able to leap tall buildings in a single bound.'' This was also shown in the movie Man of Steel. His power of flight has ranged from simply being able to jump great distances using his vast strength, to beginning in late 1941 being able to accelerate, float in midair, and change direction while traveling. Later he became able to traverse interstellar distances without stopping.
Powers and abilities of Superman