What supplies do people use to build real airplanes for other people to travel in.
Since the 1940s, most airliners have been made mostly out of aluminum. In the last decade or so, some of them have included some composite materials (plastics) for significant parts and assemblies.
At the present time, manufacturers of airliners are using increasing amounts of composites for major assemblies.
All airplanes include some steel, some plastics, rubber tires, upholstery materials, plexiglass and/or lexan for windows, copper wiring, tubing and pipes, and a wide variety of other materials in minimal roles.
Modern light airplanes, also used by people for travel, are mostly made of aluminum, with some steel and some plastics, along with all the other materials that might be used. An increasing number of light airplanes are increasingly made of composites.
Some light airplanes are still made of structural wood and plywood, and fabric, in the traditional ways. So there exist a wide variety of structural types and systems for airplanes. For much more information, try an internet search on "aircraft construction."