This is the RealFlight Expansion Pack 6 from Great Planes. **Expansion Pack 6 Offers a Free Upgrade to G4.5 for G4 Owners.** **Compatible only with RealFlight G4 and above.** FEATURES: Access to all 24 flying sites and all 70 aircraft choices originally included On RealFlight Add-Ons volumes 1-5 Adds 18 new aircraft-12 new airplanes, 5 new rotary wings, 1 aerostat and three new flying sites INCLUDES: Airplanes; AirfoilZ Extra 260 Hybrid Convair F2Y Sea Dart ElectriFly Matt Chapman Eagle 580 ElectriFly Seawind EP Seaplane ElectriFly Sequence Great Planes Escapade Great Planes Reactor 3D Great Planes Zlin Akrobat Messerschmitt ME262 Plantraco Butterfly Living Room Flyer Marston Pteroworks 52" Pterodactyl RiteWingRC Demon 40 Rotary Wings; A-19 Buzzard Heli-Max Axe CX Micro Heli-Max Novus CP Nano RJX Hobby Xtreme 90 Skyartec Wasp 200XE V4 Aerostat; Steamatic Aerostat Flying Sites; PhotoField Jefferson Airstrip PhotoField Silverton Prairie 3D Water Park/Obstacle Course 7 REQUIRES: Minimum System Requirements; Realflight Generation 4 (or above) COMPATIBILITY NOTE: Expansion Pack 6 is NOT compatible with any version of RealFlight prior to Generation 4 3GB hard drive space Intel Pentium 1.0GHz or equivalent DirectX 9 (or above) feature-compatible video and sound card 3D accelerated video card with 32 MB (or more) RAM 256 MB RAM Optimum System Requirements; Intel Pentium 3.0GHz or equivalent Dual Core 2.4GHz CPU 1 GB hard drive space 3D accelerated video card with 512 MB dedicated video memory (Pixel Shader 3.0 support) 2 GB RAM jxs 4/24/09 ir/jxs