This is the RealFlight Expansion Pack 3 from Great Planes. FEATURES: Adds another 15 aircraft and 5 more flying fields INCLUDES: Aircraft; Cessna 310 KE Flat Foamy Beechcraft Staggerwing Reactor 3D Fokker D.VII Riot 3D Little Toni SE-5a MigLET/XPD-8 Griffin Combat VTOL Piper Arrow II Kinetic 50 Heli A109 Helicopter PhotoField Sites; Avista Farms Nimabry Airport 3-D Flying Sites; Obstacle Course 4 City Park-Nighttime REQUIRES: Realflight Generation 3 or 3.5 software Minimum; 500 MB hard drive space Intel Pentium 1.0 GHz 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; Intel Pentium 3.0 GHz or equivalent 3D accelerated video card with 128 MB (or more) RAM 1 GB RAM COMMENTS: The RealFlight Expansion Pack 3 is compatible only with RealFlight Generation 3 or 3.5 software.