For every force, there is an equal or opposite reaction force - Newton's 3rd law:
Let's take an aeroplane as an example, the jets from the aeroplane are pushing the air molecules away but in turn, causing the reaction force of the air molecules going away to push the jet forward, the equal force is the air molecules being pushed back, while the opposite force is the plane is being forced forward.
How about rockets and rocket fuel, rockets will ignite the rocket fuel and the force will push the air molecules downward, but then the rocket will go up because of the opposite force pushing it upwards,
note that the reaction force is not on the same object, it is on a different object.
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