How do i get my planes to show up when im ready to fly them? they dounloaded easy but at the time of flying they don't show up. it's a mega dounload of 727-100, 727-200. after waiting 3 hours for the download to finish everything went down ok until i was ready to fly and the plane was invisible. all files are in the right place..don't have any idea what's causing it. i wonder if i have to download over them again? can someone help me on this?