is the principle how an aircraft move ahead in ground similar to how a spacecraft moves ahead in empty space? in the ground air is propelled backward and in space since it has no air, small explosion pushes the spacecraft ahead. Newtons third law. i understand in the case of spacecraft, as there is no other object to exert force on spacecraft, it has to be Newtons third law. But not sure of aircraft movement on ground just by propelling air fastly backward, the aircraft moves ahead. As there is air to interact with the aircraft. So is it just the Newtons third law as in space or there is a force exerted by the air on the aircraft to moves ahead as an action-reaction due to the aircraft thrust on the air. Or bcoz an low pressure is created ahead of the aircraft by the propeller, the aircraft is sucked forward. Note: i'm not asking how lift is produced by the wing.