| 11. | Rigid airships became the first aircraft to transport passengers and cargo over great distances.
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| 12. | Rigid airship design and advancement was pioneered by the German count Ferdinand von Zeppelin.
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| 13. | A : The LZ-127 Graf Zeppelin is considered the most successful rigid airship ever built.
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| 14. | The airport was named after the noted American Navy rigid airship pioneer, Lt . Cmdr.
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| 15. | The first American-built rigid airship, the, flew in 1923.
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| 16. | A non-rigid airship relies entirely on internal gas pressure to retain its shape during flight.
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| 17. | Unlike semi-rigid and rigid airships ( e . g.
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| 18. | France's only rigid airship was designed by Chenu 200 hp engine that drove two propellers.
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| 19. | O'Conner transfers to the US Naval Air Service and is assigned to the rigid airship.
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| 20. | The British Royal Navy took an early interest in rigid airships and ordered Wolseley engines.
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