Getting to the Nuke Plant in a single glide is not possible, no matter what the height of the starting jump. However, although you cannot touch the ground or rooftops, you land on the sides of buildings, telephone poles, trees, etc. Run up the sides of those structures to continue your glide. Be careful about what buildings you run up, or you might not get enough height to reach the next building. Jump from the casino and while in the air, use your mobile phone to call an airplane then fly close to the Nuke Plant.