Basicly, Wings Part II

For the Part I: Click Here

 When you equip a Wing, you now get the ability to fly. When you press jump button midair, you switch to the Steady Flight mode. This mode is almost same with Creative flight, but slower.
When you press spring button while the steady flight mode is still active, you switch to the Free Flight mode. In this mode, the player will be pushed continuously to the direction they're facing. By pressing W (Forward) button, you can increase the speed you're going (has a max speed) and by pressing S (Backward) button you can decrease the speed you're going. (If you hold S enough, the speed will be decreased to 0 which is the same with elytra flight.) When you're facing upwards, your speed will be decelerated if you don't have enough speed; and your speed will be accelerated when you're facing downwards.

 Wings don't have durability. Instead, they eat your saturation bar as you fly. They're eating it up too fast that you will have to constantly stop and eat food if you want to fly longer. If you don't have enough saturation to contribute the flight, you start freefalling to the ground. But fear not, wings will give you the ability to negate fall damage even if you're not flying.

 For the enchantments, I think there can be 2 new enchantments.
Flight Speed (I-V) -> Will increase your Steady Flight mode speed (same with Creative flight at max) and Free Flight mode max speed&acceleration.
Fat Saving (I-III) -> Will decrease the saturation decreation amount when flying.