As long as the amount of energy it takes for them to fly upwards some amount is less than the amount of energy it would take for them to physically move upwards then you’ve got free energy. I only used superman as an example because he’s probably the most iconic example of effortless flight. Compare it to characters like bird man that flap wings to fly.
Even if somehow there is not a single example of a character that doesn’t use energy to fly and every author made up some strange way to collect energy, you’ve still made a hyper efficient power plant using a previously unusable energy source. Like if they get power from something like “magic” in the air that recharges over time, then that’s still a brand new energy source.
As long as the amount of energy it takes for them to fly upwards some amount is less than the amount of energy it would take for them to physically move upwards then you’ve got free energy. I only used superman as an example because he’s probably the most iconic example of effortless flight. Compare it to characters like bird man that flap wings to fly.
Even if somehow there is not a single example of a character that doesn’t use energy to fly and every author made up some strange way to collect energy, you’ve still made a hyper efficient power plant using a previously unusable energy source. Like if they get power from something like “magic” in the air that recharges over time, then that’s still a brand new energy source.
Or just fucking teleporting lol