Here's a Swiss guy named Yves Rossy who has developed a personal wing which he uses to fly around after jumping out of airplanes (see video one). Apparently sky surfing just wasn't cutting it so he built this. His latest version has four mini jet engines on it which allow him to go over 120 miles an hour (see video two). Apparently the wing has cost something like 150k British pounds to put togather. As you can see in the screen capture the wings fold up for when he is inside the plane and then open up when he jumps out. His end goal is to be able to take off and land which the jet wing as well instead of launching off a second plane already in the sky.