How is plastic made strong for planes, etc?

I have heard that airplane/aircraft wings are often made out of plastic.

Not the plastic that we see everyday, but strengthened plastic.

I have to do a PowerPoint on this subject. And I was wondering if anybody knows how researchers and scientists have been able to strengthen plastic.

If I can have information/links I would greatly appreciate it.

Anything that has to do with strengthening plastic and how its done would be great.

Answer:
The plastic is reinforced with fibers of a stronger material, often graphite fibers for aircraft where strength/ weight ratio is more important than cost.
Glass fibers fibers are also used, particularly where cost is more of a factor, for example boats.
Various other fibers, Kevlar for example, can be used for specific requirements..

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How is plastic made strong for planes, etc?

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