The Wright brothers are credited with being the first persons to create, design, and fly their airplane designs.
This refers to producing a new thing that has not been done before or improving an already made design.
Hence, we can see that they both built the design and were the first to note that the two propellers should be shaped like a wing, rather than a screw, to enable better flight.
Please note that your question is incomplete because you did not include the text so we can see the description made by both Wilbur and Orville Wright.
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