A plastic composite is a material that has a polymer or plastic
as the matrix reinforced with another material - usually a fiber.
So CFRP - Carbon Fiber Reinforced Plastic is one such example.
These materials are used on newer aircraft such as the Airbus A380
and the Boeing Dreamliner 787. There are other examples including
polyesters with galss fiber. These are known as GFRP - Glass Fiber
Reinforced Plastic.