noun
staying in the air; remaining airborne
Used for aircraft, birds, or objects that maintain flight or hang in the air; often appears in compound terms like 滞空時間 (time aloft).
この飛行機の滞空時間は約12時間です。
This airplane's time aloft is about 12 hours.
鳥が風に乗って滞空している。
The bird is staying in the air riding the wind.