$49 Philadelphia International Airport 10km Low-poly 3D model by CityArt. Available on CGTrader. Check it out on CGHub.
C4D (Cinema 4D, filesize: 122 MB), OBJ (OBJ, filesize: 32.7 MB), FBX (Autodesk FBX, filesize: 9.66 MB), 3DS (3D Studio, filesize: 5.59 MB), 3DM (Rhinoceros 3D, filesize: 16 MB), STL (Stereolithography, filesize: 17.7 MB), DXF (DXF, filesize: 18.1 MB)