A fim de reduzir a seção transversal do radar (RCS) da aeronave, as coberturas F22 são revestidas com uma camada fina de óxido de índio-estanho (ITO), que lhe confere uma tonalidade dourada.
Do livro Raptor F-22 por Bill Sweetman:
The F22 Raptor canopy ... comprises two sheets of polycarbonate, sandwiched between two layers of optical glass, fusion bonded in an autoclave and drape formed over a canopy blank ... A metallic coating of indium-tin-oxide is added to the canopy to reflect the radar waves, giving it a golden tint.
Eles são usados em aeronaves furtivas para reduzir o RCS. De globalsecurity.org :
A window member composed of a transparent resin or inorganic glass with a transparent conducting film such as gold or ITO (indium tin oxide) coated thereon, is used as an electromagnetic wave shield window for stealth aircraft. Applying such transparent conducting film enables, while maintaining transparency to visible radiation, both a radio wave stealth property which scatters radio waves in various directions so as not to be detected by radar, and an electromagnetic wave shield property which prevents harmful electromagnetic waves, except for visible radiation, from invasion into an aircraft.
Esta técnica é usada em outras aeronaves como o EA6B Prowler.