In fact, there is some progress in this area. I read that a material has been created that consists of complex molecular structures. So it has interesting properties. Some of them have a negative refractive index of light – it seems to flow around a three-dimensional object covered with such material, and forces the observer to see what is behind it. A cloak made of such a fabric can make a person invisible not only in the optical, but also in the infrared part of the spectrum. Moreover, its "work" does not require power sources, mirrors, lamps or complex electronic devices. Maybe they'll come up with something for the plane soon.