To land the plane, the pilot lines it up with the runway many miles from the airport. Then he or she slowly reduces engine power, in turn reduces thrust and slows the plane down. With less air moving over the wings, the plane gradually loses lift and descends closer to the ground. Pilots carefully time the reduction in thrust and lift so that the plane touches down gently at the start of the runway (although in passenger planes, a computer-controlled autopilot typically handles the landing).
Picture Credit : Google