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The four forces of flight always act on things that fly, no matter how long the object has been in the air. The four forces of flight are lift, weight, drag, and thrust. Lift gets airplanes up into the air using differences in air pressure, weight refers to the pull of gravity, thrust propels airplanes forward, and drag is the push of air back on the airplane that slows down the airplane. Some things that influence the forces of flight change with time, like wind speed or air density. These changes influence the amount of push/pull exerted by that force, but otherwise, the four forces interact in the same way regardless of time.