kriegsmacht,
It seems that you don't fully understand the physics laws...
Let's try to explain:
The air, just like any other matter is capable to react against a force applied upon it.
For instance:
When you're standing on the floor, the gravity makes you push on the floor (force), while the floor pushes on you in opposite direction, and - if the both forces are equal - your vertical position won't change.
The principle is the same with a plane in the air (or whatever is flying), but since the air density is much lower than the floor's, you need to move the air molecules downwards in order to get enough kinetic energy to give you enough force upwards (action - reaction).
The heli uses the rotor blades to do that, while the plane uses the wings.