$79 Beechcraft Model-18 C-45 Expeditor 3D model by chipbasschao. Available on CGTrader with 70878 polys and 45396 vertices. Check it out on CGHub.
STL (Stereolithography, filesize: 35.9 MB), OBJ (OBJ, filesize: 35.9 MB), 3DS (3D Studio, filesize: 35.9 MB), C4D (Cinema 4D, filesize: 35.9 MB), DAE (Collada, filesize: 35.9 MB), FBX (Autodesk FBX, filesize: 35.9 MB), LWO (Lightwave, filesize: 35.9 MB)