"The machine may even carry mail is special cases. But the useful load will be very small. The machines will eventually be fast, they will be used in sport, but they are not to be thought of as commercial carriers."

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I have had the feeling that a properly constructed flying-machine should be capable of being flown as a kite; and conversely, that a properly constructed kite should be capable of use as a flying-machine when driven by its own propellers.

— Alexander Graham Bell