A meta-human, let's call him "Arnim", possesses the power of flight. In accordance with Einstein's law of conservation of energy, this superpower does not draw power from nothing or some nondescript alternate dimension. Rather, the way the ability works is by converting whatever energy is available in the user's direct vicinity directly into momentum. It's essentially the power to transmute energy but limited to serve only for locomotion.
Unlike Superman, this power cannot store energy for later use like some sort of battery. Instead it always uses whatever energy is immediately available to power its function. Think of it as a sort of 'funnel' that sucks whatever energy is around to propel the user.
His power sources would include Arnim's own metabolism a.k.a. the ATP breaking down in his cells at any given second, his body heat as well as the thermal energy in the air around him, the sunlight hitting his body as well as his surroundings and any ambient radiation. It goes without saying that drawing power from these sources will remove it from where it was taken: Arnim's cells will tire, his body cools down, the lights will dim and ambient radiation will be gone. There's some leeway with the exact range of absorption but that can be adjusted depending on the energy demands according to your answers. It should be noted that Arnim CAN carry around a battery to draw extra power from it... but I'd rather find out if he could fly unassisted before resorting to that very unsexy option.
Is there enough energy for Arnim to fly?
Arnim weighs a healthy average of 196.9 pounds or 89 kilos. He lives on the planet earth so 1g of gravity. The temperature is a warm 77 fahrenheit or 25°C. No clouds in the sky. No wind either.
