The meaning of a dream about the air force will depend on your general feelings about the air force and about the military.
A dream that you are a member of the air force may simply be a wish fulfillment dream, if you think that a career in the air force or in the military would be right for you.
Such a dream may also represent a desire for authority or power.
Dreaming that you are an air force pilot can signify a desire for control as well as freedom, as flying in a dream can be a symbol of freedom.
A dream that you are an air force pilot in the middle of a battle can mean that you need to look at things from a higher perspective in order to resolve a conflict.