Planes soar with the greatest of ease because of two forces: thrust and lift. Thrust is generated by the engines, which use either propellers or jets to propel the plane forward. That forward motion moves air over the wings, which are shaped so that air passes faster over their tops than bottoms. The slower-moving air below the wings creates higher pressure than the faster-moving air below the wings creates higher pressure creates lift, pushing the wings up. As long as a plane has thrust to propel air over the wings, it has lift. If a plane loses thrust, the wings “stall” and the plane plummets.
Picture Credit : Google