FSX/P3D. We have been waiting for this service pack. Hopefully it addresses all the issues we discovered during our tests. No doubt this is one of the very best looking birds gracing the skies of FS and despite simplicity and subsequent lack of completely modeled systems, it's still much fun to fly and I personally have enjoyed it immensely despite it's flaws and short comings. At the very least, hopefully all the flaws have been ironed out If you own one, grab the update. We will get the review out soon. And before you ask, yes, optimizations for improved performance is included in the SP.