Douglas DC-3 Low-poly 3D model is available on CGTrader for $15. Original author: Helijah. Specs: 406500 polys, 450954 verts.
STL (Stereolithography, filesize: 36 MB), OBJ (OBJ, filesize: 64.8 MB), BLEND (Blender, filesize: 78.1 MB), FBX (Autodesk FBX, filesize: 20.6 MB), GLTF (glTF, filesize: 41.2 MB), PNG (PNG, filesize: 19.9 MB), OTHER (Other, filesize: 63 MB)