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.
flight duration; time in the air
flight record; endurance record (in the air)
Compound of 滞 (stay, stagnate) and 空 (sky, air). The kanji combination directly conveys the meaning of remaining in the air.