The gravitonic forces pilots experience within Earth's gravity well are affected by the earths gravity, but only marginally so. Gravity itself is such a weak force that the force felt by acceleration is nearly always a dominant for. The Absence of gravity is a more serious effect on a human's physiological health. In X-Wing series books, it mentions that both Imperial and Rebel starfighters have gravity compensators sufficient to maintain standard 1G at all times. At the same token, Wedge Antilles advocates setting the compensator to compensated for 95% of the G-Forces, allowing Kinescetic sense of their piloting, also so they are not at the mercy of gravity if they lose their compensator, which in the movies and in EU kills both Porkins in ANH and Jasmin Ackbar in Wraith Squadron.(In both cases each pilot dies from crashes due to being unable to overcome the inertia force from their Starfighter Engines.