| 21. | Flight at speeds above about Mach 5 is often referred to as hypersonic.
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| 22. | Falcon is methodically proceeding toward a Hypersonic Cruise Vehicle.
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| 23. | Other potential improvements could include increasing autonomy and putting it on hypersonic missiles.
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| 24. | Backers of the technology say air-breathing hypersonic propulsion could help space travel.
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| 25. | Most of the jet travels at hypersonic speed.
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| 26. | The park added its third launched roller coaster, Hypersonic XLC, in 2001.
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| 27. | Hypersonic XLC was removed after the 2007 season.
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| 28. | The NASA X-43A hypersonic test vehicles were boosted by Pegasus first stages.
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| 29. | One such is called the Hypersonic Airplane Space Tether Orbital Launch ( HASTOL ).
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| 30. | The " Aurora " is a secret hypersonic military aircraft based at Groom Lake.
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