This trick will only work in Keys To The City, which is available for download from the Xbox Live Marketplace. During game play, press Back. Set all of your skills to have four stars. When you get in the truck cab it will morph to the biggest possible. Enable "God mode" so you will not die when attempting the jump. Also choose "Empty streets" so you do not hit cars in the process. Go onto a straight and long freeway. Gold B to speed it up then press Back. Select "Spawn ramp truck". When you are going about 190 mph hit it, then change the camera angle to the side of the truck. Then press Y to spawn the ramp truck and the glitch will begin. You will fly for a very long time.