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Which was the first commercial aircraft with 50% of its structure weight made of carbon-fiber composite?

a) Boeing 777
b) Boeing 787
c) Boeing 747
d) Airbus A380

Answer: b
Explanation: The Boeing 787 was the first commercial aircraft with 50% of its structure weight made of carbon-fiber composites, along 20% Aluminum and 15% titanium. It first flew in 2009.

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