[Guest]

You can build a plane with it but there is no IL2 exporter for it.

Deutschmark

You can export in .3ds with it , which you can open in gmax, 3DSMax and then export those Meshes to IL-2 so why not?

From Wikipedia:-

Import
Nendo (.ndo)
3D Studio (.3ds)
Adobe Illustrator (.ai)
Autodesk FBX (.fbx)
Lightwave/Modo (.lwo/.lxo)
Wavefront (.obj)
PostScript (Inkscape) (.ps)
Encapsulated PostScript (.eps)
Stereolithography (.stl)

Export
Nendo (.ndo)
3D Studio (.3ds)
Adobe Illustrator (.ai)
BZFlag (.bzw)
Kerkythea (.xml)
Autodesk FBX (.fbx)
Lightwave/Modo (.lwo/.lxo)
Wavefront (.obj)
POV-Ray (.pov)
Cartoon Edges (.eps)
Stereolithography (.stl)
Renderware (.rwx)
VRML 2.0 (.wrl)
DirectX (.x)