This is the RealFlight Expansion Pack 5 from Great Planes. **Compatible only with RealFlight G4.** FEATURES: Adds 18 new aircraft-10 Airplanes, 3 Seaplanes, 4 Rotary Wing (3 Helicopters, 1 Autogyro), and 1 Amphibious Aircraft (Flying Hydroplane) Three new flying sites INCLUDES: Airplanes; Airliner Great Planes Sukhoi SU-31 ElectriFly Reactor Bipe Top Flite P-51 Mustang Krill Katana Great Planes 38% Extra 330S Scale Sailplane RF-97 Great Planes P-40 Warhawk Douglas A-4 Skyhawk ElectriFly Pluma Bipe Seaplanes; Republic SeaBee De Havilland Beaver Dornier Do-24 Rotary Wing; AH-64 Apache Helicopter Align T-Rex 500 Helicopter Autogyro Synergy N9 Helicopter Amphibious Aircraft; Death Foil (flying hydroplane) Flying Sites; Sub Base Obstacle Course 6 Photofield REQUIRES: Minimum System Requirements; Realflight Generation 4 (or above) COMPATIBILITY NOTE: Expansion Pack 5 is NOT compatible with any version of RealFlight prior to Generation 4 500 MB 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 3D accelerated video card with 128 MB (or more) RAM 1 GB RAM