This is the RealFlight Expansion Pack 4 from Great Planes.

Adds 12 new airplanes, 4 new helicopters and 4 new flying sites Compatible only with RealFlight G3 and above software.

Airplanes :
Top Flite B-25J Mitchell
Great Planes Yak 54
Great Planes deHavilland Mosquito
MiG 15
ElectriFly Headwind B
Python Biplane
Hughes H1 Racer
Stits Sky Baby
Goldberg Tiger 2
Hobbico UpStarGreat Planes Revolver
Great Planes Spitfire

Helicopters :
HeliMax MX450 XS
CH-46 Sea Knight Micro Heli
Robinson R-22
Thunder Tiger Mini Titan

PhotoField Sites :
College Park PhotoField
3D Kemp R/C Field
3D Obstacle Course 5
PhotoField-Tarmac (full scale airport)