就轻于空气的民用航空器而言，飞行中是指自其离开地面时起至其重新着地时止。
In the case of a civil aircraft lighter than air, the expression in flight relates to the period from the moment when it becomes detached from the surface until it becomes again attached thereto.
飞船驾驶员，气球驾驶员轻于空气的航空器，例如气球的驾驶员或导航员。
A pilot or navigator of a lighter - than - air craft, such as a balloon.
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