A runway could be for an airplane or a fashion model. It’s the strip of land a plane uses to take off and land on, or a narrow platform that a model uses to show off the latest fashions.
A plane needs a runway of a certain length in order to gather enough speed to take off, and it likewise needs a long enough runway when it lands to slow down and come to a safe stop. Even the very shortest runways are more than 800 feet long — and the world's longest runway, at California's Edwards Air Force Base, is nearly 40,000 feet long. The original meaning of runway was "usual track of an animal."