비행기에

In a sentence

• 비행기에 탑승하기 전에 신분증을 확인했습니다.

  I checked the ID before boarding the airplane.

  In this sentence, '비행기에' is used as the indirect object of the action '탑승' (boarding). It refers to the airplane that is being boarded.

• 비행기에 연료가 공급되었습니다.

  Fuel was supplied to the airplane.

  Here, '비행기에' indicates the entity to which fuel is being supplied, showing the direction or target of the action.

• 비행기에 앉아서 창밖을 보았습니다.

  I sat in the airplane and looked outside the window.

  In this sentence, '비행기에' denotes the place ('in the airplane') where the action of sitting and observing occurred.