This is the 7799th most frequent Korean word.
항공편
"항공편" means "flight" or "air service."
In this sentence, '항공편' is used in a general sense referring to any international flight.
국제 항공편을 예약할 때 주의해야 합니다.
You should be cautious when booking international flights.
In this sentence, '항공편' refers to a specific flight service departing.
내일 항공편이 출발한다고 들었어요.
I heard that the flight is departing tomorrow.
Here, '항공편' is used to describe a recurring flight service.