What specific characteristic defines a sub-orbital flight mission?
Answer
It reaches space and returns without completing a full orbit around the Earth.
A sub-orbital flight is defined by the fact that the vehicle reaches the boundary of space or beyond but does not attain the necessary velocity to complete a full orbit around the planet. While it provides access to high-altitude views and a temporary experience of microgravity, it lacks the orbital velocity required to remain in space for an extended duration.

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Pronunciation of the word(s) "Spaceflight". - YouTube
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