Hey everyone, I've been having some trouble running a few add-on aircraft in FS9. The game gets incredibly sluggish when I fly these planes, but as soon as I load a different plane everything works fine. The two planes that seem to really cause problems are the Ameristar Air Cargo 737-200 file name ajib732.zip and the Mozambique Airlines 737-200 file name 7372moz.zip. Has anyone else experienced similar problems? What can I do about this?