X-Plane 9.70+ Bi-Centennial F-15B Eagle v1. The second full scale development two seat F-15 Eagle, originally called a TF-15A. F15B 71-0291 lead a full and distinguished career as a company demonstrator and development aircraft, even becoming an F-15E Strike Eagle surrogate. The livery on this jet depicts the scheme worn on a world sales campaign conducted during 1976, the US bi-centennial year. By David Austin.