Flight Sim industry is using either Base Ortho Scenery, or class based scattering of land plots.
It would be a breakthrough if x-plane could integrate with http://www.outerra.com/
It is a 3D planetary engine for seamless planet rendering from space down to the surface. Can use arbitrary resolution of elevation data, refining it to centimeter resolution using fractal algorithms.
Video demonstrating the flight sim feel.
Fractal based algorithm to generate textures...
Full scale earth ..
Sheer scenerey beauty complmenting the best flight sim engine (x-plane) ..
This can be a feature request.
Keep up the good works.