This is the 7798th most frequent Korean word.
항공기가
"Aircraft."
In this sentence, '항공기가' is the subject of the sentence describing the location and state of the aircraft.
항공기가 하늘에 떠 있습니다.
The aircraft is floating in the sky.
Here, '항공기가' serves as the subject indicating who or what caused the delay.
항공기가 늦게 도착해서 우리가 기다렸습니다.
We waited because the aircraft arrived late.
In this example, '항공기가' is the subject explaining what is made with new technology.