| 1. | Information from that instrument is used in calculating altitude and air speed.
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| 2. | -- Air speed : Mach 2, or twice the speed of sound.
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| 3. | Planes routinely use both ground speed and air speed to measure their velocity.
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| 4. | This effect, called friction, reduces air speed along the earth's surface.
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| 5. | Air speed is critical, because winds at flying altitudes are significant.
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| 6. | It measured 48 so-called parameters, such as air speed, attitude and engine performance.
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| 7. | Both are stealthy and have a maximum air speed of around Mach 0.85.
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| 8. | Air speed is variable depending on the weight of the flyer.
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| 9. | However, " It's clear there was a discrepancy in air speeds,"
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| 10. | Most modern jet powered aircraft are engineered to operate at transonic air speeds.
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