FreeCAD is not bad and used pretty extensively by the 3D printing hobbyists. It's nicely script-able with Python. However, from my experience, it's still nowh

FreeCAD is not bad and used pretty extensively by the 3D printing hobbyists. It's nicely script-able with Python. However, from my experience, it's still nowhere near the level of polish that e.g. Solidworks has, so professional work is still primarily done with non-Free tools. I have no direct information, but I'd imagine the big aerospace companies have significant proprietary internal tooling, specialized to their own work flows and IP.