Douglas DC-7C Corporate 5 (Polygon mesh 3D model) is available on CGTrader for $89. Original author: Dreamscape. Specs: 163177 polys, 83967 verts.
STL (Stereolithography, filesize: 2.21 MB), OBJ (OBJ, filesize: 2.38 MB), OTHER (Other, filesize: 2.83 MB), LWO (Lightwave, filesize: 847 KB), MAX (Autodesk 3ds Max, filesize: 1.03 MB), TEXTURES (Textures, filesize: 1.92 MB), DWG (AutoCAD, filesize: 2.08 MB), DXF (DXF, filesize: 2.06 MB), 3DM (Rhinoceros 3D, filesize: 1.56 MB), 3DS (3D Studio, filesize: 828 KB)