| 11. | Unlike Crossfield in the Skyrocket, Yeager achieved that in level flight.
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| 12. | The drawback was that it flew nose up in level flight, increasing drag.
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| 13. | It is notable for being the first aircraft to exceed in level flight.
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| 14. | Whereas the other two require continual energy even to just maintain level flight.
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| 15. | With flaps 25 and gear down, it was not possible to maintain level flight.
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| 16. | With the 540, some have reportedly reached speeds of 300 mph in level flight.
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| 17. | The project achieved level flight using fuel cells only in February and March 2008.
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| 18. | When the left wing is down, right rudder is needed to hold level flight.
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| 19. | This was supposed to afford improved visibility too, particularly straight ahead in level flight.
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| 20. | Only 20-percent power is required to keep the Cloudster in level flight .
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