Air Walk allows All For One to levitate in mid-air.
Air Walk facilitates mobility, allowing All For One better offensive and evasive abilities due to not being confined to the ground.
Air Walk has a height limit, with the user being unable to go further above than 20 meters (65'5" feet) from the ground.
All For One utilizes Air Walk in order to move around with ease, being unobstructed by the surrounding terrain.
Air Walk gives All For One a vantage point against enemies on the ground as well, as he is able to fire off attacks at them while staying away from their normal range.
- Levitation - Wikipedia article about the phenomenon this Quirk is based on.