Oh, but CF is used extensively in wings. Airbus is building A350s for Qatar entirely from CF. Nice thing about CF is it can be as stiff or as flexible as you want depending upon how many layers and direction of fibres you lay down (anisotropic). 3D-weaving to eliminate separation between layers has even more customization options.
http://compositesmanufacturingmagazi...-first-flight/
https://www.boeing.com/777x/reveal/s...mpletes-parts/
https://www.youtube.com/watch?v=QpCH9mUUEnY
Interesting development with CF is self-healing wings. The matrix includes micro glass spheres filled with healing fluid. If cracks develop, it breaks these spheres and fluid leaks out. Which then solidifies and holds cracks together!
Also recently got info from my 1st employer, Ames Research @ Moffett Field, that they're experimenting with CF for helicopter rotor-blades. Which faces lots more stress per unit area than plane wings. Next breakthrough for CF in aviation is jet-engine fan-blades made from CF!!!
