Batman, being one of the few comic book heroes without actual powers, has connected with thousands of people over the years because of this fact. Instead of using Super-strength or Super-speed he relies on his superior intellect and gadgets to defeat his enemies. Most notable of his gadgets is his cape. His cape has gone through several changes over the years. From being just plain cloth, to fireproof and bulletproof cloth , to being given a flexible skeleton to use as a glider. The latter can exist in the real world because it acts just as a hang glider works. By increasing the surface area of his falling self there is more drag due to air friction thus slowing his decent to a gentle glide. So, if given the technological means, gliding vigilantes could exist in this world.