It's conceivable that gravitic tech may be able to curve space in a fine enough manner to allow for controlled falling or gliding Especially in an atmosphere), although most likely the efficient way to vary lift is with directed thrust.
TNE explored the idea that lifters were reducing the vessel's effective density, letting it float in atmospheres but meaning you had to land on thrusters for worlds with low atmospheric pressure (which, fortunately, tend to be the low gravity ones). I quite liked that quirk.