Wingstone is a little tricky, but I've found a good way to get to him. Take the glider to Al Kharid, run through the Shantay Pass, and take a Magic carpet flight (100gp) to Pollinichev--- then take the other Carpet flight, located at the other end of Pollneavich, to Nardah. Once you arrive in Nardah run to the large crevice, keep an eye out for Wingstone as he does like to wonder, check near the carpet, the crevice, and the vast desert areas around the crevice.