There are several ways that an object can stay in air. In all cases something has to give the object energy to stay up, otherwise gravity wins. For a plane the engine provides the energy, and for a glider air currents going up.
When wind hits side of a mountain, the wind goes up, as glider pilot we love the updraft caused by collision of wind and mountain. The resulting updraft is called ridge lift. On some very special and once in a life time event the air is moist enough,the pressure is high enough, and the temperature is just right that a thin layer of clouds form right at the boundary, and if we are lucky to be at right place at the right time we can ride the updraft with with new born clouds forming underneath. See the photos below